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