Q.

Assertion (A): Magnesium is a metal

Reason (R): It has two valence electrons

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a

A is incorrect and R is correct

b

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

c

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

d

A is correct and R is incorrect

answer is B.

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Detailed Solution

The element magnesium (Mg) has two valency electrons (ns2). So, magnesium belongs to second group in the periodic table.

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