1(xi)
If an element A belongs to Period 3 and Group 2, then it will have:
- (a)3 shells and 2 valence electrons
- (b)2 shells and 3 valence electrons
- (c)3 shells and 3 valence electrons
- (d)2 shells and 2 valence electrons
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3 shells and 2 valence electrons
Reason — The period number gives the number of shells and, for Groups 1 and 2, the group number gives the number of valence electrons. Hence an element in Period 3 and Group 2 has 3 shells and 2 valence electrons (electronic configuration 2, 8, 2).