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An element x has configuration 2, 8, 2 ; its group number and period number in modern period table respectively

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2nd group, 2nd period

2nd (IIA) group, 3rd period

3rd (IIIA) groups, 3rd period

3rd group, 2nd period

answer is B.

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Detailed Solution

Valance electrons indicates group number X has 2, 8, 2
2 valence electrons so group number is two
Shell number $\to$ 3 $\to$ so 3rd period

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