Question

State the electronic configuration of hydrogen [at. no. 1].e
Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table.

Answer 1

Electronic configuration of hydrogen is 1 i.e. it has le, IP in nucleus. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H

 - 1e^- → H¹⁺ 

Li - 1e^- → Li¹⁺ Na - 1e^- = Na¹⁺

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-