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why can hydrogen be placed in group 1 and 17

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- In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. This is mainly due to a decrease in ionization energy down the group. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Where is hydrogen found on earth? 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. no. both have valency 1. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. 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. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H. Question 2. Hence, it can also be placed above the halogen group. 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 can get rid of one electron to attain noble gas configuration. H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. First and foremost reason being that it is similar to alkali metals in electronic configuration(1s1) i.e. Hydrogen shares many similarities with alkali metals, i.e. Resemblance with alkali metals it has le, IP in nucleus. 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. Astatine is placed below iodine in group 7. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Why there is an anomaly when it comes to the position of hydrogen Get the answers you need, now! Like group I elements, hydrogen has only one electron in its valence shell. Multiple Choice Questions (MCQs) [1 Mark each] Question 1. 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. Example. 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. State the electronic configuration of hydrogen [at. Like the res of column 17, it only takes 1 e- … Hydrogen is the first element in the periodic table of Mendeleev - atomic number 1. single electron in outermost shell. Metallic hydrogen was discovered in 1996. Answer: Electronic configuration of hydrogen is 1 i.e. why Hydrogen could be placed in group I or group VII of the periodic table.? -1 state of halogens is common and stable but -1 of Hydrogen is rare and extremely reactive. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. elements in group I-A. 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 Explanation : H (Z=1): K 1. Electronic configuration of hydrogen is 1 i.e. Group 1A elements such as H, Li, K,etc. Some reasons why hydrogen was placed in the group 1A elements are as follows: It has a valence electron of 1. The reactions of the Group 2 elements proceed more readily as the energy needed to form positive ions falls. In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. 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. It forms covalent compounds like halogens unlike alkali metals. it has le, IP in nucleus. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. hi.. well hydrogen IS NOT in group 1 of the periodic table.. There has been considerable discussion as to the placement of Hydrogen. 3) In some hydrogen differs from both alkali metals and halogens. 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. please remember ther is some space between the group 1A and Hydrogen. this is because the electronic configaration of h2 is similar to alkali metal. [11] 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.) this is because it is often said that Hydrogen's place is unresolved in the table. 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. 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. Astatine should react very slowly with hydrogen, even when heated. 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). Hydrogen also has only one electron. This characteristic of hydrogen matches those of alkali metals. Therefore, chlorine must have an oxidation state of +1 so that the total charge can be zero) +5 (Potassium's oxidation state is +1. Hydrogen's Placement in the Periodic Table. This leads to lower … 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. Other properties are much similar. Hydrogen is considered to be in a group of its own. Two years later, Mendeleev revised his table, placing hydrogen in group 1 above lithium, and also moving thallium to the boron group. Where do you think should hydrogen be placed in the Modern periodic table? 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. Hydrogen is placed in the group and period 1 of this table. Each water molecule (H 2 O) contains two hydrogen atoms. 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. Still, If I'd be Moseley I'd place it above the alkali metals. On newer periodic tables, that is 1 and 17. have 1 valency. It can both lose as well as gain an electron. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. The valance electronic configuration of hydrogen is the same with the group 1A elements. There are many reasons for including hydrogen among the elements in Group IA. These s-block elements are found in Group 1 and Group 2 of the periodic table and are the most active metals. Group number indicates the number of valence electrons or outer electronic configuration. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). 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