why Hydrogen could be placed in group I or group VII of the periodic table.? Hydrogen is also found in a wide range of compounds throughout the earth including hydrocarbons, acids, and hydroxides. Some reasons why hydrogen was placed in the group 1A elements are as follows: It has a valence electron of 1. hi.. well hydrogen IS NOT in group 1 of the periodic table.. This leads to lower … have 1 valency. Hydrogen has 1 valence electron (its only electron), so it is placed atop group one, however, it is not an alkali metal (the rest in that group are.) Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. It has even been suggested that hydrogen should be grouped at the head of the carbon group since, like carbon, its atom has a half-filled outer shell. Oxygen has an oxidation state of -2, so for this compound it is -6 (-2 charge x 3 atoms= -6). 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. it has le, IP in nucleus. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. Hydrogen gas is made up of diatomic molecules designated as H 2. Hydrogen is considered to be in a group of its own. Hydrogen shares many similarities with alkali metals, i.e. Li (Z=3): K 2, L 1 Ionic hydrides form when hydrogen reacts with s-block metals, not including Be and Mg. Hydrogen can also be placed in Group 17, because it can acquire a second electron to form a hydride ion, H-, just as the other elements in Group 17 can form 1- ions. That is why position of hydrogen is still undecided. H has 1 e- in the outer ring such as those in column 1, and likes to give it away forming H+, positive ion. In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. Metallic hydrogen was discovered in 1996. This characteristic of hydrogen matches those of alkali metals. Astatine is placed below iodine in group 7. [11] H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Add your answer and earn points. Hydrogen is a diatomic gas in it's elemental state, which is different from the other group one metals (and similar to the group … Similarities to Metals. The valance electronic configuration of hydrogen is the same with the group 1A elements. 1].e Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Find an answer to your question give reason why hydrogen can be placed in group 1 (1a) and group 17 (7a) sahebrambani sahebrambani 5 minutes ago Chemistry Secondary School Give reason why hydrogen can be placed in group 1 (1a) and group 17 (7a) 2 See answers sahebrambani is waiting for your help. Explanation : H (Z=1): K 1. It can both lose as well as gain an electron. The two hydrogens are the same, but some periodic tables show hydrogen in both places to emphasize that hydrogen isn't really a member of the first group or the seventh group. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Hydrogen is placed in the group and period 1 of this table. -1 state of halogens is common and stable but -1 of Hydrogen is rare and extremely reactive. Resemblance with alkali metals Multiple Choice Questions (MCQs) [1 Mark each] Question 1. The reactions of the Group 2 elements proceed more readily as the energy needed to form positive ions falls. both have valency 1. State the electronic configuration of hydrogen [at. Hence, it can also be placed above the halogen group. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H. Question 2. it is placed ABOVE the group and not as … Finally, hydrogen is sometimes placed separately from any group; this is based on its general properties being regarded as sufficiently different from those of the elements in any other group. But they hydrogen atoms can also gain one electron similar to halogens. Let us see how this plays out. It can get rid of one electron to attain noble gas configuration. Its +1 oxidation state is much stable like the others. Group number indicates the number of valence electrons or outer electronic configuration. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. This is mainly due to a decrease in ionization energy down the group. These s-block elements are found in Group 1 and Group 2 of the periodic table and are the most active metals. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Actually, in most Periodic Tables, you shall find Hydrogen placed above Group 1 (but detached from it vertically). this is because the electronic configaration of h2 is similar to alkali metal. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. On newer periodic tables, that is 1 and 17. It forms covalent compounds like halogens unlike alkali metals. elements in group I-A. Example. Each water molecule (H 2 O) contains two hydrogen atoms. Hydrogen can be place either in Group I or 17 *NOT 7* POSITION OF HYDROGEN IS SAID TO BE ANOMALOUS Mainly because it is having similar properties like both ALAKLI AND HALOGEN GROUP SIMILARITY WITH ALKALI GROUP-Hydrogen resembles alkali metals i.e. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H - 1e-→ H 1+ Li - 1e-→ Li 1+ Na - 1e-= Na 1+ It can be placed in group 17 [VIIA] As it can form a negative ion as in NaH like Halogens H + 1e-→ H 1- Cl + 1e-→ Cl 1- Electronic configuration of hydrogen is 1 i.e. Hydrogen is the first element in the periodic table of Mendeleev - atomic number 1. Why there is an anomaly when it comes to the position of hydrogen Get the answers you need, now! Use the information to predict the reaction of astatine with hydrogen. Still, If I'd be Moseley I'd place it above the alkali metals. Because hydrogen forms compounds with oxidation numbers of both +1 and -1, many periodic tables include this element in both Group IA (with Li, Na, K, Rb, Cs, and Fr) and Group VIIA (with F, Cl, Br, I, and At). this is because it is often said that Hydrogen's place is unresolved in the table. Hydrogen also resembles halogens in many ways. Hydrogen's Placement in the Periodic Table. The most common place to find hydrogen on earth is in water. Yes it can be placed in either of the groups.-----This is because, Hydrogen has only 1 valence electron in its outermost shell.Like the Group I Alkali metals it has valency = 1 i.e it can lose electron. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Like group I elements, hydrogen has only one electron in its valence shell. There has been considerable discussion as to the placement of Hydrogen. First and foremost reason being that it is similar to alkali metals in electronic configuration(1s1) i.e. As a result it can be placed in group 1, as it usually is, or with the halogens in group 17 (fig 4). Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. In this 1871 version, copper, silver, and gold were placed twice, once as part of group IB, and once as part of a "group VIII" encompassing today's groups 8 to 11. single electron in outermost shell. Two years later, Mendeleev revised his table, placing hydrogen in group 1 above lithium, and also moving thallium to the boron group. Therefore, chlorine must have an oxidation state of +1 so that the total charge can be zero) +5 (Potassium's oxidation state is +1. 1) In some properties it resembles alkali metals.As such, it can be placed in group 1 of the periodic table along with alkali metals. please remember ther is some space between the group 1A and Hydrogen. IT IS JUST PLACED ABOVE group 1 of th table as it has valency one and cannot be placed with halogens as it has just one valence electron. the main groups are numbered from 1 to 7 going from left to right, and the last group on the right is Group 0 the block in between Group 2 and Group 3 is where the transition metals are placed Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Solution: Hydrogen element has been placed at the top of group 1, above the alkali metals because the electronic configuration of hydrogen is similar to those of alkali metals. 3) In some hydrogen differs from both alkali metals and halogens. Answer: Electronic configuration of hydrogen is 1 i.e. Like the res of column 17, it only takes 1 e- … Astatine should react very slowly with hydrogen, even when heated. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Hydrogen can be placed in group number 1 or (but not normally) in group number 17 because it has some properties similar to both groups.. On one hand , it exhibits the property of alkali metals by losing one electron to get a positive charge ( H --> H + + e-). There are many reasons for including hydrogen among the elements in Group IA. Where is hydrogen found on earth? +1 (Hydrogen has an oxidation state of +1, and oxygen has an oxidation state of -2. A conceptual question: In Chemistry, Hydrogen has always been regarded as an "outlier" of sorts--exhibiting the characteristics of family 1 elements yet only have one valence electron filling the 1s orbital. The other period 1 element, helium, is most often placed in group 18 with the other noble gases, as its extraordinary inertness is extremely close to that of the other light noble gases neon and argon. no. Like group I elements, hydrogen has only one electron in its valence shell. Group 1 metals are referred to as alkali metals and have a charge of +1 Group 2 metals are referred to as alkaline earth metals and have a charge of +2. it has le, IP in nucleus. Group 1A elements such as H, Li, K,etc. atish1 atish1 13.03.2016 Chemistry Secondary School ... *but it is placed at the top of group 1 above the alkali metal. Where do you think should hydrogen be placed in the Modern periodic table? Other properties are much similar. Hydrogen also has only one electron. Hydrogen matches those of alkali metals ] hydrogen gas is made up of diatomic designated... * but it is placed at the top of group 1 above the halogen group,. 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