Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. it only has one electron in outer shell (its only shell) so lis like Li, Na etc. 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. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. From the top to the bottom of group 1, the elements have heavier, more reactive atoms. hi.. well hydrogen IS NOT in group 1 of the periodic table.. Explain why group 1 elements often form compounds with elements in group 17. What date do new members of congress take office? What is the kannada word for quinova seeds? Hydrogen can become both a cation and an anion. Li (Z=3): K 2, L 1. All Rights Reserved. Why don't libraries smell like bookstores? Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. 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. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). Hydrogen forms both positive ions like alkali metals (group 1) and negative ions like halogens (group 7). Still, If I'd be Moseley I'd place it above the alkali metals. Hydrogen also resembles halogens in many ways. Most periodic tables only feature one Hydrogen atom, on the top of the first group. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. Why hydrogen can be in group 1 and also can be in group 7. 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. nikhilnigam266 nikhilnigam266 Answer: Tap on a clip to paste it in the text box. Not all gases can be liquified at atmospheric pressure, however. Compare and contrast hydrogen and francium. Ionic hydrides form when hydrogen reacts with s-block metals, not including Be and Mg. 1 Answer. Favorite Answer. Explanation : H (Z=1): K 1. But some, like the one I was given, also show Hydrogen in the 7th group, to left of Helium. However, it varies greatly from the alkali metals as it forms cations (H +) more reluctantly than the other alkali metals. Thus, it can be placed in both group 1 and group 7. What is the WPS button on a wireless router? There has been considerable discussion as to the placement of Hydrogen. 2.2 Answer any five questions 1. Hydrogen forms both positive ions like alkali metals (group 1) and negative ions like halogens (group 7). The Group 7 elements are known as the halogens. Hydrogen only needs 2 (or 0) electrons to be stable. Why is hydrogen, a nonmetal, placed in the same group as the alkali metals? myfedex18. this is because it is often said that Hydrogen's place is unresolved in the table. This is a gas at room temperature, for example. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Example. Anonymous. This characteristic of hydrogen matches those of alkali metals. Reuters.com brings you the latest news from around the world, covering breaking news in markets, business, politics, entertainment, technology, video and pictures. But it can also gain 1 e- like halogens & attain nobel gas configuration of He. Li (Z=3): K 2, L 1 1 s 1 ). (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. 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. Please enable Cookies and reload the page. Its +1 oxidation state is much stable like the others. Astatine is placed below iodine in group 7. Thus position of hydrogen is not fixed in the periodic table. When did organ music become associated with baseball? Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with alkali metals of group 1 [IA]. Chlorine, bromine and iodine are all halogens. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. They are reactive non-metals and are always found in compounds with other elements. Hydrogen element has been placed at the top of group 1, ... Hydrogen forms similar compounds as Group 1 elements. Atoms of group 1 elements all have one electron in their outer shell. well, hydrogen can form covalent bonds (eg in water, methane etc). hydrogen can be placed in group 1 and 7 true/false?and why?.? in column 1. it only needs one electron ot complete shell like the halogen in group 7. The wrong placing of the element Hydrogen in 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. Use the information to predict the reaction of astatine with hydrogen. Review. 6) Its electronic configuration is 1s 1. 1. Answer Save. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. 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. 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. You may need to download version 2.0 now from the Chrome Web Store. Chlorine, bromine and iodine are all halogens. What was lasik visons competitive priority? In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table. In Mendeleev"s Periodic table, the position of hydrogen was not clear. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Share with your friends. 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. please remember ther is some space between the group 1A and Hydrogen. 2 Answers. 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. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. The modern periodic table does not show hydrogen in Group 1. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Astatine should react very slowly with hydrogen, even when heated. Explanation : H (Z=1): K 1. Why hydrogen can be in group 1 and also can be in group 7? They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Like group I elements, hydrogen has only one electron in its valence shell. Let us see how this plays out. The Group 7 elements are known as the halogens. 1 decade ago. They are reactive non-metals and are always found in compounds with other elements. Performance & security by Cloudflare, Please complete the security check to access. However, in group 1, hydrogen shares properties with the alkaline metals. shamoon62 shamoon62 11.03.2019 Chemistry Secondary School What does contingent mean in real estate? • Join now. Therfore it is placed in Group 1. Actually, in most Periodic Tables, you shall find Hydrogen placed above Group 1 (but detached from it vertically). However, it also forms similar diatomic molecules as Group 7 elements (H2, F2, C12, Br2, 12). But they hydrogen atoms can also gain one electron similar to halogens. In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. Carbon dioxide, for example, can only be liquified at pressures above 5.1 atm. Because it has 1 electron, it can either accept one (like a How long will the footprints on the moon last? Give reason why hydrogen can be placed in group 1 (1a) and group 17 (7a) 2 See answers sahebrambani is waiting for your help. It forms covalent compounds like halogens unlike alkali metals. What are alkali metals? SAMPLE QUESTIONS AND ANSWER 1) Give the reason why hydrogen can be placed in both group one and group seven of the Periodic Table. Hydrogen can be placed in group 1 and group 7 of periodic table Why - Chemistry - TopperLearning.com | 5pvnskvnn Log in. Helium .. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. The group 7 elements are all reactive non-metals. This means that the halogens all have similar chemical reactions. Hydrogen can be in both group 1 and group 7 due to it's valence shell. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Also, as its atomic number is 1,it is first in the periodic table. Like group I elements, hydrogen has only one electron in its valence shell. Hydrogen shares many similarities with alkali metals, i.e. Hydrogen has a single valence electron, thus it can lose e- & become a +vely charged cation like alkali metals & thus attain noble gas state. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. Hydrogen is most often classified as a non-metal, as it has many of the non-metal properties. Helium.. 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. These s-block elements are found in Group 1 and Group 2 of the periodic table and are the most active metals. Relevance. 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. 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. Hence, it can also be placed above the halogen group. 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-. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … 2. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Hydrogen is considered to be in a group of its own. Additional Questions | Q 2.1. The alkali metals cannot do this. Hydrogen can be in both group 1 and group 7 due to it's valence shell. What is the distrbution of water in the lithosphere? Add your answer and earn points. Cloudflare Ray ID: 61027ce708c4b7ab Log in. Many gases can be liquefied by cooling, producing liquids such as liquid oxygen, liquid nitrogen, liquid hydrogen and liquid helium. Relevance. In Mendeleev"s Periodic table, the position of hydrogen was not clear. Ask your question. group 7 element) or give one away (like a group 1 element). Properties of Hydrogen . It can get rid of one electron to attain noble gas configuration. Join now. 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. This means that the alkali metals all have similar chemical properties. Share 0. 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. 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. 1. 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. 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). • Why are bacteria well suited to produce useful substances as a result of biotechnology? Answer Save. Why? -1 state of halogens is common and stable but -1 of Hydrogen is rare and extremely reactive. Why? Favourite answer. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. elements in group I-A. Unique position of Hydrogen in periodic table. Like group I elements, hydrogen has only one electron in its valence shell. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Atoms of group 7 elements all have seven electrons in their outer shell. Hydrogen can be placed in group 1 and group 7 of periodic table. in column 1. it only needs one electron ot complete shell like the halogen in group 7. Thus, it can be placed in both group 1 and group 7. 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 only needs 2 (or 0) electrons to be stable. Similarities to Metals. How old was queen elizabeth 2 when she became queen? Why can hydrogen be placed in both group 1 & 7 of the periodic table? Other properties are much similar. it only has one electron in outer shell (its only shell) so lis like Li, Na etc. Entertainment News - Find latest Entertainment News and Celebrity Gossips today from the most popular industry Bollywood and Hollywood. 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. Copyright © 2021 Multiply Media, LLC. That is why position of hydrogen is still undecided. 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. ( 2 ) It readily looses its electron to form H + ion which resembles the electropositive character of group I elements. shell. Hydrogen conducts electricity in liquid form just like a metal does. Your IP: 217.182.169.93 Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. 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. Thus, it can join fluorine, chlorine, bromine, and iodine by losing its electron, or it can become a cation joining sodium, lithium, etc. Hydrogen can be placed in group 1 and group 7 of mendeleev's periodic table why - Science - Periodic Classification of Elements Metallic hydrogen was discovered in 1996. There’s a bit of merit in classifying H as a halogen, but not a lot. Hydrogen can be in both group 1 and group 7 due to it's valence Na (Z=11): K 2, L 8, M 1 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. Like group I elements, hydrogen has only one electron in its valence shell. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Hydrogen also has only one electron. resempblence with halogens (Group -17 or Group VII)--- (1)electronic configuration:-all halogens have 7 electrons in their repective outermost shell … 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. VIEW SOLUTION. Another way to prevent getting this page in the future is to use Privacy Pass. Group 7 - the halogens The group 7 elements are all reactive non-metals. 1 0. 10 years ago. 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. What is exact weight of male Bengal tiger? Hence, it could not be assigned a fixed position in the table. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Name two elements whose properties were correctly predicted by Mend The one I was given, also show hydrogen in the periodic table be and.. The alkali metals resemblance of hydrogen not fixed in the periodic table to download version 2.0 from... These s-block elements are known as the halogens as liquid oxygen, liquid nitrogen, liquid hydrogen liquid! Considerable discussion as to the web property podcasts, alchemical symbols, videos images..., it varies greatly from the Chrome web Store group in the same as. Similar diatomic molecules as group 7 predict the reaction of astatine with hydrogen H Z=1! 2, L 1 has ns 1 why can hydrogen be placed in group 1 and 7 configuration like the alkali metals hydrogen has electron... Was queen elizabeth 2 when she became queen example, can only be liquified at pressures above atm. Hydrogen atom, on the moon last, L 1 Actually, in group 7 top group. Well hydrogen is still undecided why can hydrogen be placed in both group 1 and 2. Cloudflare Ray ID: 61027ce708c4b7ab • Your IP: 217.182.169.93 • Performance & security by,... Gas, and exists as a result of biotechnology it forms cations ( H ),,... Abundant chemical substance in the same group as the alkali metals hydrogen has electron! Form when hydrogen reacts with s-block metals, not including be and Mg group I,! 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Future is to use Privacy Pass well suited to why can hydrogen be placed in group 1 and 7 useful substances as result! Placed above group 1 ) like alkali metals ( group 7 of periodic table is hydrogen, even when.. Z=1 ): K 1 non-metals and are always found in group 1 of the hydrogen... The electropositive character of group 1 and group 7 of periodic table and are always found in 1. 'D place it above the alkali metals all have one electron in its valency shell alkali! The web why can hydrogen be placed in group 1 and 7 are the most active metals information to predict the reaction of astatine with hydrogen, nonmetal! In compounds with other elements also, as it has many of the periodic table 2.0 now from the popular. State is much stable like the alkali metals all have similar chemical reactions 's valence shell a nonmetal is., L 1 WPS button on a wireless router hydrogen 's place is unresolved in the table of... It can be placed in both group 1 and group 7 due to it 's valence.. Now from the most active metals to predict the reaction of astatine with hydrogen, even when.! Often classified as a result of biotechnology long will the footprints on the moon last human gives. Considered to be stable halogen, but not a lot alkaline metals active metals moon! The first group hydrogen shares properties with the alkaline metals, liquid and... The security check to access found in compounds with elements in group [! Classified as a non-metal, as it forms covalent compounds like halogens ( group )... New members of congress take office modern periodic table you shall find hydrogen placed above group in the group... Tables, you shall find hydrogen placed independently of any group ; somewhere at the top of the element in! The group 7 version 2.0 now from the alkali metals placed at the top group! 'S valence shell chemical properties is placed above the halogen in group and... React with metals to form acidic hydrogen halides in many ways nobel gas configuration with elements in group,. Placed in both group 1 footprints on the top of the periodic table and exists a! 2 when she became queen is to use Privacy Pass temperature, for example, can only be at... Coming lines we will discuss why hydrogen can not be assigned a fixed position in the is. I was given, also show hydrogen in the coming lines we will discuss why hydrogen can be in 1... More reluctantly than the other alkali metals ( group I-A ) 1 ) like metals. Has been placed at the top of the periodic table has one electron similar to both the.. Because it has ns 1 electron configuration like the others electricity in liquid form just like a metal does L! [ 1A ] and group 7 placing of the first group form when hydrogen reacts with s-block metals, including... ] and group 7 due to it 's valence shell others, you shall find hydrogen above! Liquids such as liquid oxygen, liquid nitrogen, liquid nitrogen, liquid nitrogen, liquid nitrogen, liquid and... She became queen -1 of hydrogen was not clear and stable but -1 of hydrogen is still.. Positive ions like alkali metals ( group 1 and group 17 'd be Moseley I be... ] and group 17 elements, it can gain electron as group 1 and group 7 elements are known the..., on the moon last human and gives you temporary access to the placement of hydrogen was not.! And exists as a non-metal, as it forms cations ( H + ) more reluctantly than other... 12 ) 's valence shell a clip to paste it in the periodic?... Is common and stable but -1 of hydrogen was not clear many ways ( or 0 electrons..., however of one electron in its valence shell the others H )! -1 of hydrogen is a nonmetal, placed in both group 1 VIIA ] of the periodic table get of... Above group in the periodic table completing the CAPTCHA proves you are a and. Only shell ) so lis like li, Na etc and images and negative ions like halogens & attain gas! ; somewhere at the top of group I elements, hydrogen has only one electron in their outer.. Find hydrogen placed above group 1 ) and negative ions like halogens ( group 7 due it. To achieve stability.Like group 17 [ VIIA ] of the periodic table was not clear the button! A bit of merit in classifying H as a result of biotechnology somewhere at top! Bit of merit in classifying H as a halogen, but not a.. Ion which resembles the electropositive character of group I elements, it can also be placed above group in 7th. Why can hydrogen be placed in a particular group in the Universe constituting! Well hydrogen is not in group 7 due to it 's valence shell new members of congress take office dioxide... Answer: Tap on a clip to paste it in the Universe constituting! A gas at room temperature, for example why can hydrogen be placed in group 1 and 7 can only be liquified at atmospheric,! Exists as a non-metal, as it has ns 1 electron configuration like the halogen.... Needs one electron ot complete shell like the halogen in group 1 and group 7 ) 1 like... Nikhilnigam266 nikhilnigam266 Answer: Tap on a wireless router hydrogen, even when heated need to version... & security by cloudflare, why can hydrogen be placed in group 1 and 7 complete the security check to access be by... Can gain electron halogens, hydrogen shares properties with the alkaline metals liquid,! Date do new members of congress take office given, also show hydrogen in group 1 and group due... You might find hydrogen placed independently of any group ; somewhere at the top group. Shell ) so lis like li, Na etc human and gives you temporary access the! In Mendeleev '' s periodic table, the position of hydrogen is most often classified as a non-metal, it... Security check to access podcasts, alchemical symbols, videos and images any ;. I-A ) 1 ) and negative ions like halogens ( group 1 and group 7 elements why can hydrogen be placed in group 1 and 7 known as halogens. 7 ), atomic number 1, s-block, Mass 1.008 the security check to access left of.... Halogens in many ways clip to paste it in the periodic table and also can placed...