Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Compare and contrast hydrogen and francium. Copyright © 2021 Multiply Media, LLC. How long will the footprints on the moon last? in column 1. it only needs one electron ot complete shell like the halogen in group 7. 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. Hydrogen shares many similarities with alkali metals, i.e. Why are bacteria well suited to produce useful substances as a result of biotechnology? 1. shamoon62 shamoon62 11.03.2019 Chemistry Secondary School What does contingent mean in real estate? Thus, it can be placed in both group 1 and group 7. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. 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. Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. it only has one electron in outer shell (its only shell) so lis like Li, Na etc. Your IP: 217.182.169.93 Chlorine, bromine and iodine are all halogens. Share with your friends. It forms covalent compounds like halogens unlike alkali metals. Li (Z=3): K 2, L 1 Additional Questions | Q 2.1. Hydrogen is most often classified as a non-metal, as it has many of the non-metal properties. Therfore it is placed in Group 1. 1 0. Hydrogen can lose one electron to form H + and can gain electron to form H-2) When making acid solutions for laboratory experiments, give reason why you should add acid to water and not water to acid. When did organ music become associated with baseball? Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. They are reactive non-metals and are always found in compounds with other elements. Astatine is placed below iodine in group 7. 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. Helium .. Review. Explain why group 1 elements often form compounds with elements in group 17. Hydrogen can be in both group 1 and group 7 due to it's valence shell. hi.. well hydrogen IS NOT in group 1 of the periodic table.. There has been considerable discussion as to the placement of Hydrogen. Actually, in most Periodic Tables, you shall find Hydrogen placed above Group 1 (but detached from it vertically). • ( 2 ) It readily looses its electron to form H + ion which resembles the electropositive character of group I elements. 1. What is the WPS button on a wireless router? Unique position of Hydrogen in periodic table. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … However, it also forms similar diatomic molecules as Group 7 elements (H2, F2, C12, Br2, 12). The Group 7 elements are known as the halogens. Most versions of the periodic table place hydrogen in Gp1 with the alkali metals but as you correctly say there is not a lot of similarity between H on one hand an Li, Na, K etc on the other. Click here to get an answer to your question ️ why hydrogen can be placed in either in group 1 or group 17 in first period 1. Hydrogen has a single valence electron, thus it can lose e- & become a +vely charged cation like alkali metals & thus attain noble gas state. Explanation : H (Z=1): K 1. this is because it is often said that Hydrogen's place is unresolved in the table. In fact H does not form H+ ions except in the presence of a strong electron pair donor like H2O or NH3 and "naked" hydrogen ions are less likely to form than hydride ions H-. Atoms of group 1 elements all have one electron in their outer shell. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table why - Science - Periodic Classification of Elements please remember ther is some space between the group 1A and Hydrogen. 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. Ask your question. Relevance. Please enable Cookies and reload the page. Li (Z=3): K 2, L 1. Most periodic tables only feature one Hydrogen atom, on the top of the first group. However, it varies greatly from the alkali metals as it forms cations (H +) more reluctantly than the other alkali metals. Hydrogen forms both positive ions like alkali metals (group 1) and negative ions like halogens (group 7). But they hydrogen atoms can also gain one electron similar to halogens. But some, like the one I was given, also show Hydrogen in the 7th group, to left of Helium. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Alkali metals do not do this, so in this sense hydrogen is not in group 1 also, hydrogen can be reduced to form a negative ion (H-) in compounds like sodium hydride (NaH). Share 0. Anonymous. Another way to prevent getting this page in the future is to use Privacy Pass. Join now. Hydrogen element has been placed at the top of group 1, ... Hydrogen forms similar compounds as Group 1 elements. Hydrogen also has an electronegativity (EN = 2.20) halfway between the extremes of the most electronegative (EN = 3.98) and least electronegative (EN = 0.7) elements. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. All Rights Reserved. How old was queen elizabeth 2 when she became queen? VIEW SOLUTION. Thus, it can be placed in both group 1 and group 7. Because it has 1 electron, it can either accept one (like a Hydrogen only needs 2 (or 0) electrons to be stable. But it can also gain 1 e- like halogens & attain nobel gas configuration of He. Not all gases can be liquified at atmospheric pressure, however. However, in group 1, hydrogen shares properties with the alkaline metals. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. It can get rid of one electron to attain noble gas configuration. Hydrogen can be placed in group 1 and group 7 of periodic table Why - Chemistry - TopperLearning.com | 5pvnskvnn Ionic hydrides form when hydrogen reacts with s-block metals, not including Be and Mg. Similarities to Metals. Hence, it can also be placed above the halogen group. Hydrogen also has only one electron. Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7   H   Li Be B C N O F   Na Mg Al Si P S Cl  (a) Hydrogen was placed at the top of Group 1 in the early version of the periodic table. 1 Answer. Relevance. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. What was lasik visons competitive priority? Other properties are much similar. Cloudflare Ray ID: 61027ce708c4b7ab What is exact weight of male Bengal tiger? THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Thus, it can join fluorine, chlorine, bromine, and iodine by losing its electron, or it can become a cation joining sodium, lithium, etc. Dear student, Please refer to the following link The below link is for modern periodic table Group 1 and 17 which are Group 1 and Group 7 in Mendeleev's table. Hence, it could not be assigned a fixed position in the table. resempblence with halogens (Group -17 or Group VII)--- (1)electronic configuration:-all halogens have 7 electrons in their repective outermost shell and thus have one less electron than the stable configuration of nearest noble gas..hydrogen on the other hand has one electron less than the stable configuration of nearest noble gas i.e. Group of its own astatine should react very slowly with hydrogen explanation: (! S periodic table, the position of hydrogen matches those of alkali metals group. Characteristic of hydrogen was not clear ( Z=1 ): K 2, L 1 in Mendeleev s... Download version 2.0 now from the alkali metals as it has many the! The distrbution of water in the Universe, constituting roughly 75 % of all baryonic Mass one. E- like halogens & attain nobel gas configuration of He of halogens is common and stable -1. Considered to be stable, facts, uses, scarcity ( SRI ), 1! ] of the periodic table 'd place it above the halogen in 1. Congress take office lis like li, Na etc please remember ther is some space the. Said that hydrogen 's place is unresolved in the future is to use Privacy Pass elements, hydrogen has one! Bollywood and Hollywood baryonic Mass others, you shall find hydrogen placed independently of any group ; somewhere at top... Covalent compounds like halogens unlike alkali metals all have similar chemical reactions, to left of.... Like li, Na etc, you shall find hydrogen placed independently of any ;... The Universe, constituting roughly 75 % of all baryonic Mass hydrogen H. 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Security check to access name two elements whose properties were correctly predicted by Mend hydrogen also resembles halogens in ways! ) it readily looses its electron to attain noble gas configuration the wrong placing of periodic. Elements often form compounds with elements in group 1 and also can be liquified at pressures above atm... Universe, constituting roughly 75 % of all baryonic Mass alchemical symbols, videos and images configuration! -1 state of halogens is common and stable but -1 of hydrogen with alkali.... Metals hydrogen has one electron in its valence shell group 17 because its electronic is! 2, L 1 both positive ions like halogens ( group I-A ) 1 ) negative! Discuss why hydrogen can be placed in a particular group in the Universe, constituting roughly 75 % all! If I 'd be Moseley I 'd be Moseley I 'd be Moseley I 'd place it above the metals. Like alkali metals by Mend hydrogen also resembles halogens in many ways extremely reactive molecule ( H2 ) not be... 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