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Question

(a) What are inert elements ?

(b) Why do they exist as monoatoms in molecules ?

(c) What are valence electrons ?

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Solution

(a)
The elements present the 18th group (VIII Group) are called inert gas. They ordinarily do not enter into any reaction.

(b)
These exist as monoatoms because molecules of these elements contain only one atom.

(c)
Valence electrons: They have a complete outermost shell, (ns2 np6) = 8 electrons. so the vakence electrons = 8 (except He, it has 2).


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