Assertion (A) : The electrons present in outer most shell are called valence electrons.
Reason (R) : The valency of an element depends upon the valence electrons.

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Both A and R are correct and R is the correct explanation of A.

A is incorrect, R is correct.

A is correct, R is incorrect.

Both A and R are correct but R is not the correct explanation of A.

answer is B.

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Detailed Solution

The combining capacity of an element is called valency. All the valence electrons need not to be participation in the bond formation. Unpaired electrons participated in the bond formation.

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