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(a) Lithium, sodium, potassium are all m...

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

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(i) All these metals have one electron in their respective outermost shells. Also, all these elements of group 1 form basic oxides. (ii) The outermost shells of the atoms of helium and neon are completely filled with electrons.
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