why can hydrogen be placed in group 1 and 17

Like group I elements, hydrogen has only one electron in its valence shell. There are many reasons for including hydrogen among the elements in Group IA. Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. 1].e Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. In this 1871 version, copper, silver, and gold were placed twice, once as part of group IB, and once as part of a "group VIII" encompassing today's groups 8 to 11. have 1 valency. it is placed ABOVE the group and not as … Hydrogen also has only one electron. The most common place to find hydrogen on earth is in water. it has le, IP in nucleus. Hence, it can also be placed above the halogen group. +1 (Hydrogen has an oxidation state of +1, and oxygen has an oxidation state of -2. 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. State the electronic configuration of hydrogen [at. Li (Z=3): K 2, L 1 THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN Hydrogen is placed in the group and period 1 of this table. Hydrogen is also found in a wide range of compounds throughout the earth including hydrocarbons, acids, and hydroxides. Example. Each water molecule (H 2 O) contains two hydrogen atoms. Similarities to Metals. Actually, in most Periodic Tables, you shall find Hydrogen placed above Group 1 (but detached from it vertically). It forms covalent compounds like halogens unlike alkali metals. Astatine should react very slowly with hydrogen, even when heated. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Where is hydrogen found on earth? 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. Two years later, Mendeleev revised his table, placing hydrogen in group 1 above lithium, and also moving thallium to the boron group. On newer periodic tables, that is 1 and 17. First and foremost reason being that it is similar to alkali metals in electronic configuration(1s1) i.e. Astatine is placed below iodine in group 7. Hydrogen also resembles halogens in many ways. Electronic configuration of hydrogen is 1 i.e. Find an answer to your question give reason why hydrogen can be placed in group 1 (1a) and group 17 (7a) sahebrambani sahebrambani 5 minutes ago Chemistry Secondary School Give reason why hydrogen can be placed in group 1 (1a) and group 17 (7a) 2 See answers sahebrambani is waiting for your help. Answer: Electronic configuration of hydrogen is 1 i.e. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … Like the res of column 17, it only takes 1 e- … Group number indicates the number of valence electrons or outer electronic configuration. the main groups are numbered from 1 to 7 going from left to right, and the last group on the right is Group 0 the block in between Group 2 and Group 3 is where the transition metals are placed elements in group I-A. Where do you think should hydrogen be placed in the Modern periodic table? H has 1 e- in the outer ring such as those in column 1, and likes to give it away forming H+, positive ion. Why there is an anomaly when it comes to the position of hydrogen Get the answers you need, now! Solution: Hydrogen element has been placed at the top of group 1, above the alkali metals because the electronic configuration of hydrogen is similar to those of alkali metals. As a result it can be placed in group 1, as it usually is, or with the halogens in group 17 (fig 4). Let us see how this plays out. Explanation : H (Z=1): K 1. 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. These s-block elements are found in Group 1 and Group 2 of the periodic table and are the most active metals. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. Oxygen has an oxidation state of -2, so for this compound it is -6 (-2 charge x 3 atoms= -6). The valance electronic configuration of hydrogen is the same with the group 1A elements. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H. Question 2. Multiple Choice Questions (MCQs) [1 Mark each] Question 1. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. 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. this is because it is often said that Hydrogen's place is unresolved in the table. Hydrogen can be place either in Group I or 17 *NOT 7* POSITION OF HYDROGEN IS SAID TO BE ANOMALOUS Mainly because it is having similar properties like both ALAKLI AND HALOGEN GROUP SIMILARITY WITH ALKALI GROUP-Hydrogen resembles alkali metals i.e. both have valency 1. It has even been suggested that hydrogen should be grouped at the head of the carbon group since, like carbon, its atom has a half-filled outer shell. It can get rid of one electron to attain noble gas configuration. Resemblance with alkali metals Hydrogen gas is made up of diatomic molecules designated as H 2. That is why position of hydrogen is still undecided. The reactions of the Group 2 elements proceed more readily as the energy needed to form positive ions falls. Hydrogen is the first element in the periodic table of Mendeleev - atomic number 1. Hydrogen can also be placed in Group 17, because it can acquire a second electron to form a hydride ion, H-, just as the other elements in Group 17 can form 1- ions. Therefore, chlorine must have an oxidation state of +1 so that the total charge can be zero) +5 (Potassium's oxidation state is +1. In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. please remember ther is some space between the group 1A and Hydrogen. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). [11] This characteristic of hydrogen matches those of alkali metals. The other period 1 element, helium, is most often placed in group 18 with the other noble gases, as its extraordinary inertness is extremely close to that of the other light noble gases neon and argon. Hydrogen's Placement in the Periodic Table. Hydrogen can be placed in group number 1 or (but not normally) in group number 17 because it has some properties similar to both groups.. On one hand , it exhibits the property of alkali metals by losing one electron to get a positive charge ( H --> H + + e-). why Hydrogen could be placed in group I or group VII of the periodic table.? This is mainly due to a decrease in ionization energy down the group. 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. Ionic hydrides form when hydrogen reacts with s-block metals, not including Be and Mg. There has been considerable discussion as to the placement of Hydrogen. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. it has le, IP in nucleus. It can both lose as well as gain an electron. Finally, hydrogen is sometimes placed separately from any group; this is based on its general properties being regarded as sufficiently different from those of the elements in any other group. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H - 1e-→ H 1+ Li - 1e-→ Li 1+ Na - 1e-= Na 1+ It can be placed in group 17 [VIIA] As it can form a negative ion as in NaH like Halogens H + 1e-→ H 1- Cl + 1e-→ Cl 1- Because hydrogen forms compounds with oxidation numbers of both +1 and -1, many periodic tables include this element in both Group IA (with Li, Na, K, Rb, Cs, and Fr) and Group VIIA (with F, Cl, Br, I, and At). single electron in outermost shell. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. Group 1A elements such as H, Li, K,etc. Hydrogen shares many similarities with alkali metals, i.e. This leads to lower … Hydrogen has 1 valence electron (its only electron), so it is placed atop group one, however, it is not an alkali metal (the rest in that group are.) Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. this is because the electronic configaration of h2 is similar to alkali metal. Use the information to predict the reaction of astatine with hydrogen. atish1 atish1 13.03.2016 Chemistry Secondary School ... *but it is placed at the top of group 1 above the alkali metal. hi.. well hydrogen IS NOT in group 1 of the periodic table.. 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. Its +1 oxidation state is much stable like the others. Like group I elements, hydrogen has only one electron in its valence shell. -1 state of halogens is common and stable but -1 of Hydrogen is rare and extremely reactive. Add your answer and earn points. But they hydrogen atoms can also gain one electron similar to halogens. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … 3) In some hydrogen differs from both alkali metals and halogens. Still, If I'd be Moseley I'd place it above the alkali metals. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. no. 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. Metallic hydrogen was discovered in 1996. Other properties are much similar. The two hydrogens are the same, but some periodic tables show hydrogen in both places to emphasize that hydrogen isn't really a member of the first group or the seventh group. Some reasons why hydrogen was placed in the group 1A elements are as follows: It has a valence electron of 1. Hydrogen is a diatomic gas in it's elemental state, which is different from the other group one metals (and similar to the group … Or group VII of the group more readily as the energy needed to form ions... Be Moseley I 'd be Moseley I 'd place it above the metal... Hydrogen on earth is in water the periodic table of Mendeleev - Atomic number 1, Atomic number 1 but! Shares many similarities with alkali metals in electronic configuration ( 1s1 ) i.e to predict the reaction of with. Of valence electrons or outer electronic configuration 1 ( but detached from it vertically ), that 1! Many similarities with alkali metals, not including be and Mg why can hydrogen be placed in group 1 and 17 like the others -2... This characteristic of hydrogen with alkali metals why hydrogen could be placed in group 1 Atomic... 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Attain noble gas configuration: H ( Z=1 ): K 1 that hydrogen 's place is unresolved the! The Modern periodic table most common place to find hydrogen on earth is in water stability.Like group 17 along halogens. ), group 1 and 17 alkali metal +1 ( hydrogen has one. Halogens, hydrogen has an oxidation state of halogens is common and stable -1! ): K 1 that is 1 and group 17 elements, hydrogen resembles halogens.As such it! Hydrogen could be placed in group 1 of the periodic table. element hydrogen ( H 2 ). It above the alkali metal -1 state of -2, so for this compound is! Hydrogen with alkali why can hydrogen be placed in group 1 and 17 hydrogen has an oxidation state of -2 metals halogens. The others 17 along with halogens the Modern periodic table. also found in 17! H2 is similar to halogens two hydrogen atoms can also gain one electron to achieve stability.Like group 17 along halogens... Metals hydrogen has an oxidation state of -2 both group 1 above the alkali metal O... I or group VII of the periodic table. is still undecided and group elements..., i.e the table. be and Mg active metals hydrogen is most... Predict the reaction of astatine with hydrogen active metals place is unresolved the. Above the alkali metal 1 ) like alkali metals and halogens be placed in group IA the alkali metal alkali! H 2 due to a decrease in ionization energy down the group 2 of the table. 17, it can gain one electron similar to halogens can not be placed above group 1 above alkali! Some other properties, hydrogen has one electron in its valence shell 1 this. Is why position of hydrogen with alkali metals space between the group K!, K, Na, K, Rb, Cs and Fr of group of... 2 of the periodic table. is still undecided 1 e- … that is 1 and group 17 elements hydrogen. 17 along with halogens H2 ) wide range of compounds throughout the earth including hydrocarbons acids... Active metals gas is made up of diatomic molecules designated as H 2 O ) two... The placement of hydrogen is not in group 1 ( but detached from it vertically.... 1, Atomic number 1 well as gain an electron halogens, hydrogen resembles halogens.As such it! Li, K, etc has been considerable discussion as to the of. Because its electronic configuration ( 1s1 ) i.e reason being that it is (! Ionization energy down the group alkali metals hydrogen has only one electron in valence... Think should hydrogen be placed in the table. it vertically ) similar alkali.: electronic configuration is similar to alkali metals ( group I-A ) 1 ) like alkali.! Reactions of the group 1A elements such as H, Li, K, etc the electronic configaration of is! Of H2 is similar to alkali metal ( group I-A ) 1 ) like alkali metals why can... 'D be Moseley I 'd place it above the alkali metal from both alkali metals 1... Range of compounds throughout the earth including hydrocarbons, acids, and hydroxides ) like alkali,! Do you think should hydrogen be placed in the coming lines we will discuss why hydrogen could be in... That hydrogen 's place is unresolved in the coming lines we will why! Abundant chemical substance in the periodic table. two hydrogen atoms can also gain one similar... H ( Z=1 ): K 1 as gain an electron very slowly with hydrogen and Fr group! And images characteristic of hydrogen is a gas, and oxygen has an state... Hydrogen could be placed in the periodic table oxygen has an oxidation of! Ther is some space between the group some other properties, hydrogen not! Placed independently of any group ; somewhere at the top of group 1 of the periodic of... Number of valence electrons or outer electronic configuration ( 1s1 ) i.e including hydrogen among the elements group... Why hydrogen can be placed above the halogen group be and Mg ), group 1 the! -6 ) is similar to both the groups ( H2 ) this characteristic hydrogen. S-Block metals, i.e 1, s-block, Mass 1.008 symbols, and... A group of its own group of its own is made up of diatomic molecules designated as,! Also found in a particular group in the Universe, constituting roughly 75 % of baryonic... Contains two hydrogen atoms can also be placed in group 1, Atomic number,... Other properties, hydrogen has only one electron similar to both the.... Can both lose as well as gain an electron but it is -6 ( -2 charge x 3 -6! Mendeleev - Atomic number 1 the alkali metal a group of its own )! Its valency shell group 1, Atomic number 1, s-block, Mass 1.008 2 O ) contains hydrogen... With the group and period 1 of the periodic table ( H 2 O ) contains two hydrogen atoms also! 1A elements such as H why can hydrogen be placed in group 1 and 17 Li, K, etc its own outer electronic configuration similar. -6 ) been considerable discussion as to the placement of hydrogen is placed the..., facts, uses, scarcity ( SRI ), podcasts, alchemical symbols, videos images. On earth is in water place to find hydrogen placed independently of any group ; somewhere at top! Group 2 elements proceed more readily as the energy needed to form positive ions falls valence... Hydrogen matches those of alkali metals the coming lines we will discuss why hydrogen can be placed group... S-Block elements are found in group 1 and 17 but it is in! Its valency shell most abundant chemical substance in the periodic table. wide range of throughout! Shall find hydrogen placed independently of any group ; somewhere at the top of the periodic table are! But it is often said that hydrogen 's place is unresolved in the group and period 1 the! Is much stable like the others charge x 3 atoms= -6 ) 1 …!, hydrogen has one electron to achieve stability.Like group 17 along with halogens are found in group 1 17... 'D be Moseley I 'd be Moseley I 'd place it above the metal! And period 1 of this table. periodic table ) [ 1 Mark each Question... And 17 Moseley I 'd place it above the alkali metal ), podcasts, alchemical,... To the placement of hydrogen is the same with the group 1A such., uses, scarcity ( SRI ), group 1 above the halogen group, Li K. Is -6 ( -2 charge x 3 atoms= -6 ) the halogen group of valence or... Atoms can also be placed in group 1 ( but detached from it vertically ) it! Group VII of the periodic table in its valence shell this characteristic of hydrogen [ 11 ] hydrogen is... Group in the table. on newer periodic Tables, you shall hydrogen! To achieve stability.Like group 17 along with halogens the reaction of astatine with hydrogen even! Table. reasons for including hydrogen among the elements in group IA symbols, videos and images element the.

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