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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 similarly 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 ?

Text Solution

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(a) All these metals are highly reactive, they have same valence electrons i.e., 1 and Can readily loose electrons to become positive ions.
(b) Helium and neon have completely filled outermost shell.
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