Compounds of Lewis-valent elements

MBE(NCl3) 277 kJ mol as compared to a mean bond energy of 329 kJ mol in PCI3. 

The valence shell electron configuration of the Group 15 elements is ns np. Tiie valence angles in PH3, AsHs, SbH3 and BiH3 indicate that 2c bonding MOs are formed by combination of nearly pure valence shell p orbitals on the central atom with Is orbitals on the H 

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