Q.

Assign the position of the element having outer electronic configuration ns2np4 for n=3

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a

third period, 16th group

b

second period, l5th group

c

third period, 14th group

d

fourth period, l5th group

answer is A.

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Detailed Solution

The configuration ns2np4 for n = 3 means element belongs to third period. Since, last electron enters in the p-orbital, it belongs to p-block. For p-block elements, the group number = 10 + valence shell electrons =10+(2+4)=16Hence, the element belongs to 16th group.
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