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.) 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. Where do you think should hydrogen be placed in the Modern periodic table? Answer: Electronic configuration of hydrogen is 1 i.e. please remember ther is some space between the group 1A and Hydrogen. it is placed ABOVE the group and not as … Hydrogen is placed in the group and period 1 of this table. Oxygen has an oxidation state of -2, so for this compound it is -6 (-2 charge x 3 atoms= -6). why Hydrogen could be placed in group I or group VII of the periodic table.? Electronic configuration of hydrogen is 1 i.e. have 1 valency. Hydrogen shares many similarities with alkali metals, i.e. Where is hydrogen found on earth? Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. There has been considerable discussion as to the placement of Hydrogen. Each water molecule (H 2 O) contains two hydrogen atoms. Hydrogen also resembles halogens in many ways. Some reasons why hydrogen was placed in the group 1A elements are as follows: It has a valence electron of 1. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Explanation : H (Z=1): K 1. 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. it has le, IP in nucleus. 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. Hydrogen's Placement in the Periodic Table. State the electronic configuration of hydrogen [at. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. 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. 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- [11] First and foremost reason being that it is similar to alkali metals in electronic configuration(1s1) i.e. 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. Hydrogen is a diatomic gas in it's elemental state, which is different from the other group one metals (and similar to the group … The valance electronic configuration of hydrogen is the same with the group 1A elements. In the coming lines we will discuss why hydrogen can not be placed in a particular group in the periodic table. 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 also has only one electron. 3) In some hydrogen differs from both alkali metals and halogens. 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. As a result it can be placed in group 1, as it usually is, or with the halogens in group 17 (fig 4). Two years later, Mendeleev revised his table, placing hydrogen in group 1 above lithium, and also moving thallium to the boron group. 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). elements in group I-A. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. 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. Li (Z=3): K 2, L 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. THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN no. Hydrogen is the first element in the periodic table of Mendeleev - atomic number 1. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. But they hydrogen atoms can also gain one electron similar to halogens. Therefore, chlorine must have an oxidation state of +1 so that the total charge can be zero) +5 (Potassium's oxidation state is +1. The reactions of the Group 2 elements proceed more readily as the energy needed to form positive ions falls. On newer periodic tables, that is 1 and 17. +1 (Hydrogen has an oxidation state of +1, and oxygen has an oxidation state of -2. Why there is an anomaly when it comes to the position of hydrogen Get the answers you need, now! Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. 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. Like group I elements, hydrogen has only one electron in its valence shell. Example. single electron in outermost shell. 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-). Its +1 oxidation state is much stable like the others. This leads to lower … Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. These s-block elements are found in Group 1 and Group 2 of the periodic table and are the most active metals. Other properties are much similar. It can get rid of one electron to attain noble gas configuration. H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. -1 state of halogens is common and stable but -1 of Hydrogen is rare and extremely reactive. 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. Resemblance with alkali metals That is why position of hydrogen is still undecided. both have valency 1. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H. Question 2. This characteristic of hydrogen matches those of alkali metals. this is because the electronic configaration of h2 is similar to alkali metal. Use the information to predict the reaction of astatine with hydrogen. 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. Hydrogen is considered to be in a group of its own. Multiple Choice Questions (MCQs) [1 Mark each] Question 1. Ionic hydrides form when hydrogen reacts with s-block metals, not including Be and Mg. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … 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. H has 1 e- in the outer ring such as those in column 1, and likes to give it away forming H+, positive ion. Let us see how this plays out. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. Like the res of column 17, it only takes 1 e- … 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 Hydrogen is also found in a wide range of compounds throughout the earth including hydrocarbons, acids, and hydroxides. 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. Group number indicates the number of valence electrons or outer electronic configuration. It forms covalent compounds like halogens unlike alkali metals. Like group I elements, hydrogen has only one electron in its valence shell. Add your answer and earn points. Astatine is placed below iodine in group 7. Astatine should react very slowly with hydrogen, even when heated. Actually, in most Periodic Tables, you shall find Hydrogen placed above Group 1 (but detached from it vertically). 1].e Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Similarly, it can gain one electron to achieve stability.Like Group 17 elements,it can gain electron. this is because it is often said that Hydrogen's place is unresolved in the table. it has le, IP in nucleus. It can both lose as well as gain an electron. 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. 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. There are many reasons for including hydrogen among the elements in Group IA. 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