Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases (d) alkaline earth metals. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (Group 2, or alkaline earth metals) of the periodic table:they each have the same electron configuration in their outer electron shell producing a similar crystal structure. Which alkaline earth metal is most reactive? 27 28 29. C. Lithium (Li) is the first element of group $1,$ therefore, it is the lightest alkali metal of its group. Group 2A: The Alkaline Earth Metals. The alkali metals have low melting points, ranging from a high of 179 °C (354 °F) for lithium to a low of 28.5 °C (83.3 °F) for cesium. Although the lightest of the rigid metals, beryllium is extremely strong. 1. Small amounts of beryllium added to oxidizable metals generate protecting surface films, reducing inflammability in magnesium and tarnishing in silver alloys. Be is the lightest of the alkaline earth metals so definitely its oxide has greater percentage of oxygen (63.97%) than others. Featured. It has various applications, as in making ceramic ware used in rocket engines and high-temperature nuclear devices. Question: Choose The Element Among These That Is The Lightest Alkaline Earth Metal. Compound B reacts with water to give C and D. A solution of C becomes 'milky' on bubbling carbon dioxide. Flashcard Content Overview. Lithium is part of the alkali metal group and can be found in the first column of the periodic table right below hydrogen. Lithium. The lightest alkaline metal is beryllium (Be) with an atomic number of 4 and an atomic mass of 9.012182. 39. 1 decade ago. Interesting Facts about Alkaline Earth Metals They are called alkaline because they form solutions with a pH greater than 7, making them bases or "alkaline." Beryllium-copper (2 percent beryllium) is made into tools for use when sparking might be dangerous, as in powder factories. Give the atomic symbol of the elements with the following Z value, and classify each as a metal, metalloid, or nonmetal: a) Z = 19; b) Z = 12; c) Z = 32. 3Mg + 2NH 3 → Mg 3 N 2 + H 2. Alkali Metals. ALKALI METALS Found in group 1 of the periodic table … Li Be Na Mg K Ca Rb Sr Cs Ba Fr Ra ALKALI AND ALKALINE EARTH METALS 4. They are silvery or gray in color. Beryllium’s dimensional stability and its ability to take a high polish have made it useful for mirrors and camera shutters in space, military, and medical applications and in semiconductor manufacturing. Unlike the other alkaline earths, it tends to form covalent bonds in nature due to its large charge to size ratio. Be Mg Ca Sr Answer : C Solution : Calcium is the lightest alkaline earth metal (density=1.55g ). The lightest alkaline metal is beryllium (Be) with an atomic number of 4 and an atomic mass of 9.012182. Calcium and magnesium are important for animal and plant life. B. Beryllium (Be) is the first element of group $2,$ therefore it is the lightest alkaline earth metal of its group. Thus, beryllium and magnesium, the lightest alkaline earth metals, are the least reactive. Which of the following subshells in a typical polyelectron atom fills last? Alkaline Earth Metals . Beryllium is the only stable light metal with a relatively high melting point. Beryllium is the chemical element with the symbol Be and atomic number 4. Calcium and barium are weakly radioactive: calcium contains about 0.1874% cacium-41, and barium contains about 0.1062% barium-130. There are two allotropes of of calcium. Li - Lithium. Magnesium oxide crystallizes in the rock-salt structure and has some typical semiconducting properties, such as wide valence band (~6 eV), large dielectric constant (9.8), and small exciton binding energy (<0.1 eV). The method used by both men was reduction of the chloride by the potent “new” reductant, potassium: Equation 21.21 BeCl2(s) +2K(s)→ΔBe(s) +2KCl(s) 5 MPa. They are also relatively soft metals: sodium and potassium can be cut with a butter knife. What is the lightest alkaline earth metal? Alkaline Earths. Calcium is the fifth more prevalent element in the human body. Get a Britannica Premium subscription and gain access to exclusive content. The method used by both men was reduction of the chloride by the potent “new” reductant, potassium: (21.5.1) … Aside from being very light, it is known for being very stiff. Alkaline earth metals react vigorously with halogens, forming metal halides with the general formula. Like the other alkaline earth metals, it is a reactive metal that slowly tarnishes in air. The name "alkaline earths" comes from an old name for the oxides of the elements. The alkaline earth metals are the second most reactive family of elements. There are about 30 recognized minerals containing beryllium, including beryl (Al2Be3Si6O18, a beryllium aluminum silicate), bertrandite (Be4Si2O7(OH)2, a beryllium silicate), phenakite (Be2SiO4), and chrysoberyl (BeAl2O4). Alkaline Earth Metals Also called as Group II A elements. Element Category: Alkaline earth metal . What is another name for the rare earth elements. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.. Lithium, the lightest of the alkali metals, is the only alkali metal which reacts with nitrogen at standard conditions, and its nitride is the only stable alkali metal nitride. Because of their reactivity, the alkaline earth metals are not found free in nature. All of the alkaline earth metal atoms have a +2 oxidation state. A. Al B. Li C.Na C D Be E. None of these are alkaline earth metals Omissions? Calcium is the lightest of the alkaline earth metals with a density of 1.55 g/cm3. Become a … The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.inorgchem.9b01058. Several antacids use magnesium hydroxide to neutralize excess stomach acid. Be Give the atomic symbol of the elements with the following Z value, and classify each as a metal, metalloid, or nonmetal: a) Z = 19; b) Z = 12; c) Z = 32. Discoverer: Vauquelin, Nicholas Louis. In 1807, Humphry Davy investigated chlorine and discovered that it is an actual element. Previous question Next question Transcribed Image Text from this Question. Beryllium is the lightest alkaline earth metal and the least reactive alkaline earth metal. All the alkaline earth metals have two ... Calcium-48 is the lightest nuclide to undergo double beta decay. the lightest alkali metal with three neutrons; Show Selected Answers Glossary. Where are alkaline earth metals found in nature? The decay of beryllium-7 (53.2-day half-life) in the Sun is the source of observed solar neutrinos. Beryllium is widely distributed in Earth’s crust and is estimated to occur in Earth’s igneous rocks to the extent of 0.0002 percent. The alkaline earth metals are found in group IIA of the periodic table, which is the second column of elements. Alternatively, the hydroxide can be heated to form the oxide, which in turn can be treated with carbon and chlorine to form beryllium chloride; electrolysis of the molten chloride is then used to produce the metal. Beryllium chloride (BeCl2) catalyzes the Friedel-Crafts reaction and is used in cell baths for electrowinning or electrorefining beryllium. Rb - Rubidium. Supporting Information . What is alkaline earth metal in chemistry? One useful exception is the heat-treatable alloy beryllium-copper. Beryllium is a steel-gray metal that is quite brittle at room temperature, and its chemical properties somewhat resemble those of aluminum. So basically, this term alkaline means that the solution has a pH greater than seven and is basic. Choose the element among these that is the lightest alkaline earth metal. Since then beryllium mixed with an alpha emitter such as radium, plutonium, or americium has been used as a neutron source. 2.0k VIEWS. Can you use hair straightening brush on wet hair? Like the other alkaline earth metals, it is a reactive metal that slowly tarnishes in air. Be. Lv 4. Additionally, what is unique about alkaline earth metals? ALKALI AND ALKALINE EARTH METALS are a group of chemical elements in the periodic table with very similar properties. 1s b. Choose the element among these that is the lightest alkaline earth metal. Under standard conditions, it is the lightest metal and the lightest solid element. Even at high and low temperatures, it can retain its original shape. Write a symbol for each of the following neutral isotopes. Beryllium forms organic coordination compounds and bonds directly with carbon in several air- and moisture-sensitive classes of organometallic compounds (e.g., beryllium alkyls and aryls). Assertion Alkaline earth metals have lower melting points than alkali metals. Radium is formed from the decay of uranium. Still have questions? And it's also the lightest earth metal. Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons. What is internal and external criticism of historical sources? It has many functions in the body, but mostly it is used to provide support for the skeleton. Answer. A. Al B. Li C.Na C D Be E. None Of These Are Alkaline Earth Metals. Beryllium was discovered (1798) as the oxide by French chemist Nicolas-Louis Vauquelin in beryl and in emeralds and was isolated (1828) as the metal independently by German chemist Friedrich Wöhler and French chemist Antoine A.B. This reactivity is due to high electronegativity and high effective nuclear charge. Moreover, it has high resistance to both heat and corrosion and can be machined to very close tolerances. 3. Atoms, Molecules and Ions. Ring in the new year with a Britannica Membership. 2. This set of flashcards will focus on the Alkaline Earth Metals of the periodic table. The alkaline earth metals are six chemical elements in group 2 of the periodic table. Phenomenological models based on the difference of the electronegativities imply the ionic character of about 20-30 for the investigated molecules, except ones involving the lightest alkaline-earth-metal atoms [ ] . The periodic table is made up of 118 elements. In this quiz you’ll be shown all 118 chemical symbols, and you’ll need to choose the name of the chemical element that each one represents. Join Yahoo Answers and get 100 … Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases (d) alkaline earth metals. Calcium. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? Choose the element among these that is the lightest alkaline earth metal a. Li b. 1 answer. It does not occur free in nature. They are also the most commercially important members of the family. In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Calcium, atomic number 20, is the lightest alkaline earth metal, with a density of 1.55 g/cm3, lighter than both beryllium and magnesium. The alkaline earth elements are metallic elements found in the second group of the periodic table. What are the names of Santa's 12 reindeers? Our editors will review what you’ve submitted and determine whether to revise the article. Their abundances in the core are also thought to be negligible. The alpha particles released by radioactive decay of radium atoms react with atoms of beryllium to give, among the products, neutrons with a wide range of energies—up to about 5 × 106 electron volts (eV). Among people who work with beryllium, exposure can lead to berylliosis (also called chronic beryllium disease [CBD]), characterized by decreased lung capacity and effects similar to those caused by the poison gas phosgene. D. Oxygen $(\mathrm{O})$ is the first element of group $16,$ therefore it is the lightest chalcogen of its group. (The precious forms of beryl, emerald and aquamarine, have a composition closely approaching that given above, but industrial ores contain less beryllium; most beryl is obtained as a by-product of other mining operations, with the larger crystals being picked out by hand.) Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases (d) alkaline earth metals. The electronegativity of the Ag and Cu atoms is twice larger than that of the alkali-metal and alkaline-earth-metal atoms. Beryllium (Be), Calcium (Ca), Strontium (Sr), Barium (Ba) , and Radium (Ra) 13. Alkaline earth metals react vigorously with halogens, forming metal halides with the general formula. Click to see full answer . Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases Page 12 of 18 Answer c. Li. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Beryllium. Bussy by the reduction of its chloride with potassium. Discoverer: Vauquelin, Nicholas Louis. These chemical properties, coupled with its excellent electrical conductivity, high heat capacity and conductivity, good mechanical properties at elevated temperatures, and very high modulus of elasticity (one-third greater than that of steel), make it valuable for structural and thermal applications. © AskingLot.com LTD 2021 All Rights Reserved. Fr - Francium. Beryllium is the lightest alkaline-earth metal found in the table of elements. Beryllium. (a) noble gas; (b) chalcogen; (c) alkaline earth metal; (d) alkali metal In studying the periodic table, you might have noticed something about the atomic masses of some of the elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. Be. Uses of Alkaline Earth Compounds Since magnesium burns brightly, it is used in flares and fireworks. A. Unlike the other alkaline earths, it tends to form covalent bonds in nature due to its large charge to size ratio. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Lithium metal floating on paraffin oil. In this paper, chemical storage materials of hydrate of alkaline earth metals at low temperatures are rported by differential scanning calorimetry (DSC). Chemistry. Be. Source(s): lightest alkaline earth metal: https://biturl.im/YP6DD. All of the alkaline earth metals except magnesium and strontium have at least one naturally occurring radioisotope. Using the periodic table, identify the lightest member of each of the following groups: (a) noble gases (b) alkaline earth metals (c) alkali metals (d) chalcogens (a) He; (b) Be; (c) Li; (d) O . 4. Fluorine is one of the most reactive elements. What alkaline-earth metal has the lightest atoms? This rare element is the lightest of the alkaline earth metals. M agnesium is a chemical element with symbol Mg and atomic number 12. This problem has been solved! At room temperature lithium is a soft metal that is silvery-white in color. Scheele called the element "dephlogisticated muriatic acid", which is how chlorine was known for 33 years. All alkaline earth elements have an oxidation number of +2, making them very reactive. Magnesium is the lightest of the metals that can be safely handled, being less than two thirds as dense as aluminium. Beryllium, magnesium, calcium, strontium, barium and radium are all shiny, and silvery-white. Jump To. The oxides of the alkaline-earth metals are basic (i.e., alkaline, in contrast to acidic). Using the periodic table, identify the lightest member of each of the following groups: (a) noble gases (b) alkaline earth metals (c) alkali metals (d) chalcogens Solution (a) He; (b) Be; (c) Li; (d) O 40. Hydrogen is not considered a metal, even though it does exist in Group I (alkali metals) of the periodic table. Beryllium is the lightest alkaline-earth metal found in the table of elements. Please select which sections you would like to print: Corrections? '. Because of their reactivity, the alkaline metals are not found free in nature. We use these compounds to highlight the differences in the organometallic chemistry of the lightest alkaline earth metals, magnesium and beryllium, in an otherwise identical chemical environment. Beryllium. Magnesium alloys with aluminum provide light weight and sturdy materials for airplanes, missiles, and rockets. (a) the halogen in the same period as the alkali metal with 11 protons (b) the alkaline earth metal in the same period with the neutral noble gas with 18 electrons (c) the noble gas in the same row as an isotope with 30 neutrons and 25 protons (d) the noble gas in the same period as gold. The trend of increasing reactivity within the group is shown by the way the alkaline earth metals behave in the presence of water. Beryllium (Be), the lightest alkaline earth metal, was first obtained in 1828 by Friedrich Wöhler in Germany and simultaneously by Antoine Bussy in France. In this work, we have performed a comparative study of the structures, stabilities, and properties of some alkaline earth metal oxides (, , , and ). Professor, Department of Chemistry, Vanderbilt University, Nashville, Tennessee. Alkaline earth metal [He] 2s 2: 5: B: Boron: Metalloid [He] 2s 2 2p 1: 6: C: Carbon: Other nonmetal [He] 2s 2 2p 2: 7: N: Nitrogen : Other nonmetal [He] 2s 2 2p 3: 8: O: Oxygen: Other nonmetal [He] 2s 2 2p 4: 9: F: Fluorine: Halogen [He] 2s 2 2p 5: 10: Ne: Neon: Noble gas [He] 2s 2 2p 6: Lithium. Beryllium does not react with either water or steam, even when heated red-hot. Beryllium is the lightest of the alkaline earth metals. This is because: View solution. (a) noble gas; (b) chalcogen; (c) alkaline earth metal; (d) alkali metal In studying the periodic table, you might have noticed something about the atomic masses of some of the elements. Alkali metals are in group IA on the far left side of the periodic table. Updates? The United States has about 60 percent of the world’s beryllium and is by far the largest producer of beryllium; other major producing countries include China, Mozambique, and Brazil. Choose the element among these that is the lightest alkaline earth metal. Also to know is, what is the heaviest alkaline earth metal? The element is purified by vacuum melting. All alkaline earth elements have an oxidation number of +2, making them very reactive. Using the periodic table, identify the lightest member of each of the following groups: a) noble gases b) alkaline earth metals. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure. 4. Cs - Caesium. 39. All the alkaline earth metals readily lose their two outermost electrons to form cations with a 2+ charge. Beryllium is fabricated into gyroscopes, accelerometers, and computer parts for inertial guidance instruments and other devices for missiles, aircraft, and space vehicles, and it is used for heavy-duty brake drums and similar applications in which a good heat sink is important. Answer b. 600 MPa. ARTICLE SECTIONS. Treatment with acids, roasting with complex fluorides, and liquid-liquid extraction have all been employed to concentrate beryllium in the form of its hydroxide. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. The first ionization energies of alkaline earth metals are higher than those of the alkali metals. Elements can be classified as metals, metalloids, and nonmetals, or as a main-group elements, transition metals, and inner transition metals. Identify A, B, C and D. View solution. The most lightest alkaline earth metal is: View solution. Ammonia and alkaline earth metals. Because of their reactivity, the alkaline earth metals are not found free in nature. Helium (He) is the first element of group 18, therefore, it is the lightest noble gas of its group. It rapidly … In this work, we have performed a comparative study of the structures, stabilities, and properties of some alkaline earth metal oxides (, , , and ). The alkaline earth elements are metallic elements found in the second group of the periodic table. 3. They are highly … It has an atomic number of 4, because there are four protons in every beryllium atom, and an atomic mass of approximately 9.012. Alkaline earth metal. Expert Answer . Historically important examples of the use of beryllium/radium neutron sources include the bombardment of uranium by German chemists Otto Hahn and Fritz Strassmann and Austrian-born physicist Lise Meitner, which led to the discovery of nuclear fission (1939), and the triggering in uranium of the first controlled-fission chain reaction by Italian-born physicist Enrico Fermi (1942). Like the alkali metals, the group 2A elements are all solids with typical metallic properties, some of which are listed in Table 7.5. Halogen and alkaline earth metals. Alkaline Earth Metals. Click to see full answer. The oxygen compound beryllium oxide (beryllia, BeO) is a high-temperature refractory material (melting point 2,530 °C [4,586 °F]) characterized by an unusual combination of high electrical resistance and dielectric strength with high thermal conductivity. Halogens are highly reactive, and they can be harmful or lethal to biological organisms in sufficient quantities. One of the lightest, yet strongest metals, with a high melting point at 2348 degrees Fahrenheit. Choose the element among these that is the lightest alkaline earth metal. Interesting Facts about Alkaline Earth Metals. The alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, and radium) are the second most reactive metals in the periodic table (Table 3.7), and, like the Group 1 metals, have increasing reactivity in the higher periods. Calcium, atomic number 20, is the lightest alkaline earth metal, with a density of 1.55 g/cm3, lighter than both beryllium and calcium. It is also mildly reactive, but it does not react with water. Basic beryllium carbonate, BeCO3∙xBe(OH)2, precipitated from ammonia (NH3) and carbon dioxide (CO2), along with basic beryllium acetate, Be4O(C2H3O2)6, are used as a starting material for synthesis of beryllium salts. The hydroxide is converted to fluoride via ammonium beryllium fluoride and then heated with magnesium to form elemental beryllium. Emerald is now known to be a green variety of beryl. Using the periodic table, identify the lightest member of each of the following groups: a. noble gases b. alkaline earth metals c. alkali metals d. chalcogens. They are called alkaline earth metals because they form alkaline solutions (hydroxides) when they react with water . The alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, ... Na, and K, the lightest alkaline-earth element Be, and the lightest halogen F. They are used to define the volatility trend of the bulk Earth. 4d c. 4s d. 5p e. More information is needed. The alkaline earth metals are shiny, silvery-white, and somewhat reactive metals at standard temperature and pressure. Beryllium. Halogens can gain an electron by reacting with atoms of other elements. Using the periodic table, identify the lightest member of each of the following groups: (a) noble gases (b) alkaline earth metals (c) alkali metals (d) chalcogens Solution (a) He; (b) Be; (c) Li; (d) O 40. Much beryllium is used as a low-percentage component of hard alloys, especially with copper as the main constituent but also with nickel- and iron-based alloys, for products such as springs. Alkaline earth metals react with halogens and form halides. 0 0. Show transcribed image text. Compared with the alkali metals, the alkaline earth metals are harder, are more dense, and melt at higher temperatures. How many alkaline metals are there? What was the arsenal of democracy speech? This reaction is a exothermic reaction. If radium is encapsulated, however, so that none of the alpha particles reach beryllium, neutrons of energy less than 600,000 eV are produced by the more-penetrating gamma radiation from the decay products of radium. The most lightest alkaline earth metal is: View solution. Under standard conditions, it is the lightest metal and the lightest solid element. The alkaline earths possess many of the characteristic properties of metals.Alkaline earths have low electron affinities and low electronegativities.As with the alkali metals, the properties depend on the ease with which electrons are lost.The alkaline earths have two electrons in the outer shell. Magnesium and calcium are the only abundant alkaline earth metals in the Earth’s crust. ALKALINE EARTH METALS Also called as Group II A elements. Although it is readily attacked by alkalies and nonoxidizing acids, beryllium rapidly forms an adherent oxide surface film that protects the metal from further air oxidation under normal conditions. 3. K - Potassium. Element Category: Alkaline earth metal . Nitrogen is an unreactive gas because breaking the strong triple bond in the dinitrogen molecule (N 2 ) requires a lot of energy. Metallic hydrogen has been predicted at extremely high pressure (e.g., interior of Jupiter), under which compressed hydrogen atoms lose their electrons to delocalization ("sea of electrons"). Their half-lives range from 1.5 million years (for beryllium-10, which undergoes beta decay) to 6.7 × 10−17 second for beryllium-8 (which decays by two-proton emission). Ask Question + 100. 118 Names and Symbols of the Periodic Table Quiz. 6.941 amu. Beryllium. GROUP 1 By: Intes, Axyl Sarip, Jennan Maat, Kriaza Millare, Winde Tan, Maita Endriga, Khys Myrrh 2. Let us know if you have suggestions to improve this article (requires login). Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases Page 12 of 18 Beryllium is a slightly toxic, silvery-gray metal. Alkaline and Alkaline Earth Metals 1. Groups are numbered 1–18 from left to right. Element A burns in nitrogen to give an ionic compound B. How to remember the Alkali Metals ? Both the finely divided metal and soluble compounds in the form of solutions, dry dust, or fumes are toxic; they may produce dermatitis or, when inhaled, a hypersensitivity to beryllium. actinide: inner transition metal in the bottom of the bottom two rows of the periodic table. Be c. Na d. None of these are alkaline earth metals e. Al. He. Articles from Britannica Encyclopedias for elementary and high school students. Beryllium (Be), the lightest alkaline earth metal, was first obtained in 1828 by Friedrich Wöhler in Germany and simultaneously by Antoine Bussy in France. The lightest of alkaline earth metals is Beryllium. The rare-earth elements are sometimes called 'rare-earth metals,' 'lanthanides,' and, more recently, 'lanthanoids. 2. Be. 3. Na - Sodium. 1 decade ago. 0 0. Even at high and low temperatures, it can retain its original shape. It is very radioactive and is dangerous to handle. Use the periodic table to give the name and symbol for each of the following elements: a) the noble gas in the same period as germanium . Uses include x-ray tubes and aerospace construction. Beryllium is the lightest of the alkaline earth metals. Aside from being very light, it is known for being very stiff. Due to release of hydrogen gas, ammonia behaves as an acid. Topics. Reason Metallic bonding is much stronger in alkaline earth metals as two electrons are present in the valence shell. Phenomenological models based on the difference of the electronegativities imply the ionic character of about 20-30 for the investigated molecules, except ones involving the lightest alkaline-earth-metal atoms [ ] . They are also relatively soft and low in density. Z = 19 K metal Z = 12 Mg metal Z = 32 Ge metalloid. Alkaline Earth Metals. Related Video. Beryllium itself does not reduce sparking, but it strengthens the copper (by a factor of 6), which does not form sparks upon impact. 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The heaviest alkaline earth metals are basic ( i.e., alkaline, contrast! Reactivity within the group is shown by the way the alkaline earth metals react with water high point!, lightest of the periodic table lightest of the alkaline earth metals as two electrons present... Antacids use magnesium hydroxide to neutralize excess stomach acid not considered a metal is beryllium ( ). Both heat and corrosion and can be cut with a 2+ charge, more recently, 'lanthanoids m is.