Chemistry
State the electronic configuration of hydrogen [at. no. 1]. Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table.
Answer
Hydrogen has the simplest electronic configuration of 1.
As hydrogen has 1 valence electron, so it either loses one electron and behaves like electropositive alkali metals of group 1 or it gains one electron and behaves like electronegative halogens of group 17. Hence, it shows similarities with alkali metals as well as halogens, therefore, it can be placed in group 1 [1A] or group 17 [VIIA] of the periodic table.
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