why can hydrogen be placed in group 1 and 7

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

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