Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … At standard temperature and pressure hydrogen is a colorless, odorless, and tasteless gas. 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. 1) Electronic configuration : Like alkali metals, hydrogen also contains 1 electron in its outermost shell. Non-remnant stars are mainly composed of hydrogen in the plasma state. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H. Question 2. Group number indicates the number of valence electrons or outer electronic configuration. Like group I elements, hydrogen has only one electron in its valence shell. In hydrides, hydrogen is bonded with a highly electronegative atom so their properties are more distinguished. Hydrogen can be placed in both group 1 and group 17 because its electronic configuration is similar to both the groups. I did some research and found a few science magazine articles. For example, it forms stable/meta-stable peroxides/superoxides, like alkali metals, particularly potassium and beyond. 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. But it is not a halogen either. (a) Halogen is a Greek word which means salt-former’. Understand the Modern periodic law, periods and rows, and trends in period... Study of early attempts of classification, Mendeleev's periodic table-Achi... Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day. Why is hydrogen in 1. and in 17. group. (5)Like alkali metals hydrogen also act as a strong reducing agent .. resempblence with halogens(Group -17 or Group VII)---. There has been considerable discussion as to the placement of Hydrogen. they exist naturally in various mineral salts in […] Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). Contact us on below numbers, Kindly Sign up for a personalized experience. thus hydrogen like alkali metals exhibit electropositive character... (3).oxidation state :-like alkali metals hydrogen exhibits an oxidation state of +1 in its compounds... for example- HCl ,, NaCl ,, KBr ...here oxidation state of H is same as Na and K i.e. Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns 1 electron configuration like the alkali metals. Therefore, instead keeping Hydrogen in group of halogens it should be in group 1st that is alkali metals group. Join now. 1. Hydrogen can be in both group 1 and group 7 due to it's valence shell. As the radius of the atom increases down group 17 from top to bottom, and the valence shell electrons are increasingly shielded, the positively charged nucleus exerts less of an attractive force on the electrons so it has less ability to attract electrons towards itself, hence, electronegativity decreases down the group from top to bottom. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). 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). This lightness of hydrogen made it a natural for one of its first practical uses - filling balloons. It would just float away. He did so because hydrogen and alkali metals have similar properties. this is because it is often said that Hydrogen's place is unresolved in the table. james harrington asked the Naked Scientists: Dear Dr. Chris, I'm a GCSE chemistry student (taking it through to AS and A level) and i've always been puzzled why hydrogen is in group 1 of the periodic table (with the alkali metals). Don’t worry, let us know and we will help you master it. That is why position of hydrogen is still undecided. Similar to group 17, it will attract one electron to complete its shell. It is estimated that 90% of the visible universe is composed of hydrogen. 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. Group 17 elements are also known as: (a) halogens (2) (name still in common use) (b) Group VIIA (name no longer used) Group 17 elements are non-metals; Group 17 elements exist as diatomic molecules (X 2) when not combined with other elements. With special reference to valency electrons & ion formation. Hydrogen is considered as a very unique element.The position of this small element in the periodic table is debatable. At room tempreture, they exist as diatomic molecules , single covalent bond between the two atoms in each molecule. Hydrogen is an oddball, thats why is has its own space next to helium. There are many reasons for including hydrogen among the elements in Group IA. ... Give the general group characteristic applied to hydrogen with respect to similarity in properties of hydrogen with halogens of group 17 [VIIA]. Hence, it can also be placed above the halogen group. 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. 2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens. Why is hydrogen placed in group one of the periodic table? Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Hydrogen is the raw fuel that most stars 'burn' to produce energy. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table.Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. Hydrogen also resembles halogens in many ways. That H is a gas and a nonmetal whereas group 1 are metals and mostly solid at or near room temperature is no big deal. Middle School. Group 17 Elements. please remember ther is some space between the group 1A and Hydrogen. Li reacts with water to produce hydrogen gas. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. They aren’t that different. (b) This is because halogens are reactive non-metals. All rights reserved. The group number determines how many electrons are on the outer shell of the atom. The group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. Because Hydrogen only has 1 electron, it has 1 electron on it's outer shell. +1.. (4)combination with non-metals:-like alkali metals hydrogen combines with non-metals such as oxygen and sulphur forming their oxides and sulphides...for example-- H2O, like Na2O ,K2O. They are called “halogens” because they give salts when they react with metals.So, now you know what halogens are! no. Such that in the chart below comparing boiling points of groups 14-17 hydrides, the values of ammonia (NH 3), water (H 2 O), and hydrogen fluoride (HF) break the increasing boiling point trend. 2) Electropositive character: Like alkali metals ,hydrogen also loses its only electron to form hydrogen ion i.e. VIEW SOLUTION. hi.. well hydrogen IS NOT in group 1 of the periodic table.. - The group 17 element are all non-metals. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). have 1 valency. Thus it can lose an electron to achieve a stable configuration like alkali metals and hence can be placed in group 1 … The prime components of air, nitrogen and oxygen, are fourteen and sixteen times heavier, giving hydrogen dramatic buoyancy. Helium .. (2)electronegative character:-halogens have a strong tendency to gain one electron to form halide ions ..in a similar way hydrogen shows some tendency to gain one electron to form hydride ion .. H + e- -----> H(-) (He gas configuration), Cl + e -----> Cl(-) (Ar gas configuration). 3) In some hydrogen differs from both alkali metals and halogens. Electronic Configuration: Like all the elements of the group, Hydrogen also has one electron in … Hydrogen resembles alkali metals i.e. Lithium 1s 2 2s 1. between group 14,15, and 16 there is a patern between the boiling points with the boiling point being higher for the higher group- but group 17 dosn't fit the pattern it has lower boiling point then group 15 - why? In others, you might find hydrogen placed independently of any group; somewhere at the top of the Periodic Table. Why is hydrogen placed in group 1 IA and group 17 VIIA ? This is one of the factors that dictates the position of hydrogen in the table. Hydrogen was first recognized as a distinct element by Henry Cavendish in 1766. That is why position of hydrogen is still undecided. Ltd. All rights reserved. Hydrogen is the chemical element with the symbol H and atomic number 1. They are very soft metals, which become liquid just above room temperature. Clean Energy Group raises concerns about harmful NOx emissions from new industry plans to burn hydrogen in fossil fuel power plants; calls for pause in permitting proposals until independent public health investigations are conducted -- particularly to study potentially dangerous air pollution impacts in environmental justice communities. So its possible that hydrogen can … It burns when it comes into contact with oxygen. A good periodic table shows hydrogen by itself. The hydrides of nonmetals on the periodic table become more electronegative as you move from group 13 to 17. (3)ionization energy:-ionization enrgy of hydrogen is similar to that of halogens but much higher than alkali metals.. for example ionizaion energy of H = 1312 kj/mole, ionizaion energy of F(a halogen) = 1681 kj/mole, ionizaion energy of Cl(a halogen) = 1255 kj/mole, ionizaion energy of Na (an alkali metal) = 496 kj/mole, ionizaion energy of K (an alkali metal) = 419 kj/mole. H + Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Hydrogen 1s 1. Resemblance Of Hydrogen With Alkali Metals(Group I-A) 1) Like alkali metals hydrogen has one electron in its valency shell. He positioned hydrogen in the first column above alkali metals. Indeed, some versions of the periodic table place hydrogen above fluorine in Group 17 because the addition of a single electron to a hydrogen atom completes its valence shell. But it is not a metal. Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe. Because hydrogen is so light, the pure element isn't commonly found on the Earth. The alkali metals also react readily with water to produce hydrogen gas and metal hydroxides in the following video: Alkali Metals: Explosive reactions. With special reference to valency electrons & ion formation. (1)electronic configuration :- like alkali metals hydrogen also contains one electron in its outermost shell... hydrogen's electronic configuration = 1s1, lithium' electronic configuration = 1s2 2s1, sodium's electronic configuration = 1s2 2s2 2p6 3s1, (2)electropositive character:- like alkali metals hydrogen also looses its only one electron to form hydrogen ion ,H(+). it has le, IP in nucleus. Want a call from us give your mobile number below, For any content/service related issues please contact on this number. 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. 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