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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.
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Solution
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- → H1-
Cl + 1e- → Cl1-
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