Introduction and Position of Hydrogen in Periodic Table
- Hydrogen is the first element in the periodic table and lightest of all elements.
- The electronic configuration of hydrogen can be written as 1s1.
- Hydrogen has three isotopes, Protium(1H1), Deuterium(1H2) and Tritium(1H3).
- Protium and Deuterium are non-radioactive whereas Tritium is radioactive.
Position of Hydrogen in Periodic Table :
Hydrogen is placed in no specific group due to its property of gaining electron and also losing electron.
(1) Hydrogen is placed in group-I
- It has one electron in its outer shell like other alkali metals
- It forms monovalent H+ ion like Li+, Na+....
- It is a good reducing agent like Na, Li
(2) Hydrogen also resembles halogens
- It is diatomic(H2) like F2, Cl2
- It also forms anion H− like F−, Cl−
- H is one electron short of duplet like F, Cl which are also one electron deficient than octet
- IE of H is of the same order as that of halogens
Part1: View the Topic in this Video from 0:55 to 10:28
Part2: View the Topic in this Video from 0:05 to 12:07
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