Justify the position of hydrogen atom in both the groups, Group 1and Group 17.
1)Hydrogen is the first element in the periodic table.
2)It is the lightest element known.
3)It atomic form exists only at high temperature.
4)It exist as a diatomic molecule i.e. H2 .That is why it is also called dihydrogen.
5) It was discovered by Henry Cavendish in 1766.
6) Its electronic configuration is 1s1
Unique position of Hydrogen in periodic table
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.
2) In some other properties, hydrogen resembles halogens.As such, it can be placed in group 17 along with halogens.
3) In some hydrogen differs from both alkali metals and halogens.
Resemblance with alkali metals
Hydrogen resembles alkali metals i.e. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table.
1) Electronic configuration : Like alkali metals, hydrogen also contains 1 electron in its outermost shell.
Hydrogen 1s1
Lithium 1s2 2s1
Sodium 1s2 2s2 2p6 3s1
2) Electropositive character: Like alkali metals ,hydrogen also loses its only electron to form hydrogen ion i.e. H+
H ——-> H+ + e‾
Na ———-> Na+ + e‾
Hydrogen like alkali metals exhibit electropositive character.
3) Oxidation State: Like alkali metals, hydrogen exhibits an oxidation state of +1 in its
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