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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) Yes, The atoms of all the three elements lithium, sodium a d potassium have one electron in their outermost shells.
b) Both helium(He) and Neon (Ne) have filled outermost shell s. Helium has a duplet in its K shells, while neon has an octet in its L shells.
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