First slide

Occurrence, Electronic Configuration

Question

The elements $B, C, N of 2 period in p block exibit maximum covalency of$

Moderate

A

2
B

3
C

4
D

5

Solution

B forms ${BF}_{4}^{-},$ C forms CH₄ and N forms ${NH}_{4}^{+}$ .
Oxygen can show maximum covalence 3 only as in H₃O⁺.

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