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