JEE Main · 2024 · 04 Apr 2024 · Shift 1 · p-Block Elements

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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✓ Correct

Answer: (D)

Solution

Group valency is reached only if an element can accommodate enough bonds. Among B, C, N, S, O, F, P, Al, Si, the second-period elements N, O, F cannot expand their valency to the group value (5, 6, 7 respectively) because they have no low-energy vacant

2 d

orbitals — the second shell holds at most 8 electrons.

The others (B=3, C=4, S=6, P=5, Al=3, Si=4) do reach their group valency. So the count that CANNOT is 3

\Rightarrow

option D.

JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Single correct option

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