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Tina Singh • 10.68K Points
Tutor II Chemistry
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(A) 4
(B) 2
(C) 12
(D) 3
Correct Answer - Option(D)
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Explanation by: Tina Singh
Element with electronic configuration 2,8,2 belongs to 3rd period and 2nd group. The valence electrons give us the idea of group number. As the electrons are divided into 3 different shell therefore period number is 3

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