Carbon dioxide, for example, can only be liquified at pressures above 5.1 atm. Thus position of hydrogen is not fixed in the periodic table. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. 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. Astatine should react very slowly with hydrogen, even when heated. Hydrogen can be in both group 1 and group 7 due to it's valence shell. Why is hydrogen, a nonmetal, placed in the same group as the alkali metals? The modern periodic table does not show hydrogen in Group 1. Log in. You may need to download version 2.0 now from the Chrome Web Store. Hydrogen only needs 2 (or 0) electrons to be stable. Properties of Hydrogen Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. (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. Also, as its atomic number is 1,it is first in the periodic table. The alkali metals cannot do this. myfedex18. From the top to the bottom of group 1, the elements have heavier, more reactive atoms. Anonymous. Hydrogen can be placed in group 1 and group 7 of periodic table. Why? Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. What was lasik visons competitive priority? 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. SAMPLE QUESTIONS AND ANSWER 1) Give the reason why hydrogen can be placed in both group one and group seven of the Periodic Table. Performance & security by Cloudflare, Please complete the security check to access. Thus, it can be placed in both group 1 and group 7. The group 7 elements are all reactive non-metals. 2. What is the kannada word for quinova seeds? Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table. They are reactive non-metals and are always found in compounds with other elements. Entertainment News - Find latest Entertainment News and Celebrity Gossips today from the most popular industry Bollywood and Hollywood. When did organ music become associated with baseball? Like group I elements, hydrogen has only one electron in its valence shell. Your IP: 217.182.169.93 If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. in column 1. it only needs one electron ot complete shell like the halogen in group 7. VIEW SOLUTION. Hydrogen only needs 2 (or 0) electrons to be stable. Hydrogen shares many similarities with alkali metals, i.e. However, it varies greatly from the alkali metals as it forms cations (H +) more reluctantly than the other alkali metals. • Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 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. 2.2 Answer any five questions 1. hi.. well hydrogen IS NOT in group 1 of the periodic table.. View the latest business news about the world’s top companies, and explore articles on global markets, finance, tech, and the innovations driving us forward. All Rights Reserved. Therfore it is placed in Group 1. 1 decade ago. Copyright © 2021 Multiply Media, LLC. Li (Z=3): K 2, L 1. Why are bacteria well suited to produce useful substances as a result of biotechnology? Why hydrogen can be in group 1 and also can be in group 7? This means that the halogens all have similar chemical reactions. Group 7 - the halogens The group 7 elements are all reactive non-metals. 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. nikhilnigam266 nikhilnigam266 Answer: Tap on a clip to paste it in the text box. 10 years ago. Review. 1 Answer. 1. Additional Questions | Q 2.1. Metallic hydrogen was discovered in 1996. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. What date do new members of congress take office? Thus, it can be placed in both group 1 and group 7. Atoms of group 7 elements all have seven electrons in their outer shell. Li (Z=3): K 2, L 1 What does contingent mean in real estate? it only has one electron in outer shell (its only shell) so lis like Li, Na etc. Chlorine, bromine and iodine are all halogens. What are alkali metals? Why don't libraries smell like bookstores? 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. Favourite answer. 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. The Group 7 elements are known as the halogens. Helium .. Log in. 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).The alkali metals cannot do this. in column 1. it only needs one electron ot complete shell like the halogen in group 7. However, it also forms similar diatomic molecules as Group 7 elements (H2, F2, C12, Br2, 12). Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Still, If I'd be Moseley I'd place it above the alkali metals. Ask your question. 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. Join now. Hydrogen is most often classified as a non-metal, as it has many of the non-metal properties. However, in group 1, hydrogen shares properties with the alkaline metals. Reuters.com brings you the latest news from around the world, covering breaking news in markets, business, politics, entertainment, technology, video and pictures. Answer Save. ( 2 ) It readily looses its electron to form H + ion which resembles the electropositive character of group I elements. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Hydrogen only needs 2 (or 0) electrons to be stable. Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. Helium.. 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. In this sense, hydrogen is more like a halogen and so you could say it is in group 7 So, hydrogen is basically an anomaly. But they hydrogen atoms can also gain one electron similar to halogens. What is the distrbution of water in the lithosphere? Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Chlorine, bromine and iodine are all halogens. Hence, it could not be assigned a fixed position in the table. Answer Save. There has been considerable discussion as to the placement of Hydrogen. Why? But some, like the one I was given, also show Hydrogen in the 7th group, to left of Helium. This is a gas at room temperature, for example. It forms covalent compounds like halogens unlike alkali metals. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. 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. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. Hydrogen is considered to be in a group of its own. Not all gases can be liquified at atmospheric pressure, however. Please enable Cookies and reload the page. this is because it is often said that Hydrogen's place is unresolved in the table. 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. Join now. Thus, it can join fluorine, chlorine, bromine, and iodine by losing its electron, or it can become a cation joining sodium, lithium, etc. Unique position of Hydrogen in periodic table. Give reason why hydrogen can be placed in group 1 (1a) and group 17 (7a) 2 See answers sahebrambani is waiting for your help. Compare and contrast hydrogen and francium. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. 1. The wrong placing of the element Hydrogen in the periodic table. Share 0. Na (Z=11): K 2, L 8, M 1 Favorite Answer. What is exact weight of male Bengal tiger? Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. group 7 element) or give one away (like a group 1 element). But it can also gain 1 e- like halogens & attain nobel gas configuration of He. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN hydrogen can be placed in group 1 and 7 true/false?and why?.? In Mendeleev"s Periodic table, the position of hydrogen was not clear. Use the information to predict the reaction of astatine with hydrogen. Atoms of group 1 elements all have one electron in their outer shell. it only has one electron in outer shell (its only shell) so lis like Li, Na etc. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Why can hydrogen be placed in both group 1 & 7 of the periodic table? Why hydrogen can be in group 1 and also can be in group 7. There’s a bit of merit in classifying H as a halogen, but not a lot. It can get rid of one electron to attain noble gas configuration. How old was queen elizabeth 2 when she became queen? They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. This characteristic of hydrogen matches those of alkali metals. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. Like group I elements, hydrogen has only one electron in its valence shell. This means that the alkali metals all have similar chemical properties. elements in group I-A. A proper position could not be assigned to it because of the following reason: 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. 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-. Hydrogen forms both positive ions like alkali metals (group 1) and negative ions like halogens (group 7). Hydrogen element has been placed at the top of group 1, ... Hydrogen forms similar compounds as Group 1 elements. 6) Its electronic configuration is 1s 1. The Group 7 elements are known as the halogens. well, hydrogen can form covalent bonds (eg in water, methane etc). The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Hydrogen can be in both group 1 and group 7 due to it's valence shell. I once saw a periodic table that placed hydrogen in its usual home at the top of the alkalis, but also placed a ghostly sorta grayed-out hydrogen at the top of the halogens. 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. Hydrogen can be in both group 1 and group 7 due to it's valence Relevance. Astatine is placed below iodine in group 7. Explain why group 1 elements often form compounds with elements in group 17. These s-block elements are found in Group 1 and Group 2 of the periodic table and are the most active metals. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Cloudflare Ray ID: 61027ce708c4b7ab Like group I elements, hydrogen has only one electron in its valence shell. Explanation : H (Z=1): K 1. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table why - Science - Periodic Classification of Elements 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. Name two elements whose properties were correctly predicted by Mend Most periodic tables only feature one Hydrogen atom, on the top of the first group. That is why position of hydrogen is still undecided. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). 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. -1 state of halogens is common and stable but -1 of Hydrogen is rare and extremely reactive. Add your answer and earn points. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. Hydrogen can be placed in group 1 and group 7 of periodic table Why - Chemistry - TopperLearning.com | 5pvnskvnn How long will the footprints on the moon last? Hydrogen forms both positive ions like alkali metals (group 1) and negative ions like halogens (group 7). Actually, in most Periodic Tables, you shall find Hydrogen placed above Group 1 (but detached from it vertically). please remember ther is some space between the group 1A and Hydrogen. Similarities to Metals. Ionic hydrides form when hydrogen reacts with s-block metals, not including Be and Mg. They are reactive non-metals and are always found in compounds with other elements. Example. shamoon62 shamoon62 11.03.2019 Chemistry Secondary School Properties of Hydrogen . resempblence with halogens (Group -17 or Group VII)--- (1)electronic configuration:-all halogens have 7 electrons in their repective outermost shell … 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. shell. Because it has 1 electron, it can either accept one (like a On the basis of electronegativity, it is tempting to classify hydrogen as a semimetal, as shown in the three-dimensional graph of the electronegativities of the main-group elements shown below. Many gases can be liquefied by cooling, producing liquids such as liquid oxygen, liquid nitrogen, liquid hydrogen and liquid helium. Share with your friends. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. 1 0. 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. Hydrogen conducts electricity in liquid form just like a metal does. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Hydrogen can become both a cation and an anion. Relevance. In Mendeleev"s Periodic table, the position of hydrogen was not clear. In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. Hence, it can also be placed above the halogen group. Hydrogen also resembles halogens in many ways. 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). Explanation : H (Z=1): K 1. 2 Answers. Let us see how this plays out. 1 s 1 ). Its +1 oxidation state is much stable like the others. Other properties are much similar. Hydrogen also has only one electron. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. 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Non-Metal, as its atomic number is 1, hydrogen has one electron in its valence shell element been... Are always found in group 1 [ 1A ] and group 17 because its electronic configuration is similar both. Why is hydrogen, a nonmetal, placed in a group of its own I given!