Question

Lithium Sodium Potassium are all metals that react with water to liberate hydrogen gas is there any similarity in the atoms of these elements

Answer 1

The similarity between lithium, sodium and potassium is that they all have one electron in their valence shell , that is, their valency is 1.
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Answer 2

not similarity here is all tge reactant is metal and all metel have free electron that help yo liberate the hydrogen gas