Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ______. B, C, N, S, O, F, P, Al, Si (A) 7 (B) 5 (C) 6 (D) 3

Question

Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ______. B, C, N, S, O, F, P, Al, Si

(A) 7
(B) 5
(C) 6
(D) 3

Prashant Kotian · Accepted Answer

Correct answer: D. N,O, F can’t extend their valencies upto their group number due to the non-availability of vacant 2d like orbital.

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