The outer most shell of a representative element contains $^{'} a^{'}$ electrons and penultimate shell contains $^{'} b^{'}$ electrons. The valency of the element will be:

a + b

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b - a

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b

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a

8 - a

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Solution

The correct option is D $a$ or $8 - a$
When the outermost electron shell of a representative element contains $^{'} a^{'}$ electrons, the valency of the element will be equal to $^{'} a^{'}$ or $8 - a^{'}$ .

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The outer most shell of a representative element contains ′a′ electrons and penultimate shell contains ′b′ electrons. The valency of the element will be:

The correct option is D a or 8−aWhen the outermost electron shell of a representative element contains ′a′ electrons, the valency of the element will be equal to ′a′ or 8−a′.

The outer most shell of a representative element contains $^{'} a^{'}$ electrons and penultimate shell contains $^{'} b^{'}$ electrons. The valency of the element will be:

The correct option is D $a$ or $8 - a$
When the outermost electron shell of a representative element contains $^{'} a^{'}$ electrons, the valency of the element will be equal to $^{'} a^{'}$ or $8 - a^{'}$ .