Ncert Exercises & Solutions

The electronic configurations of three elements, A, B, and C are given below.

A 1s² 2s² 2p⁶
B 1s²2s² 2p⁶ 3s² 3p³
C 1s²2s² 2p⁶ 3s² 3p⁵

The molecular formula of the compound formed from B and C will be

1. $BC$

2. $B_{2} C$

3. ${BC}_{2}$

4. ${BC}_{5}$

The electronic configuration show that B represents phosphorus and C represents chlorine. The stable compound formed is PCl5 i.e., BC5.

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