Q. 145.0( 1 Vote )

In the following

Answer :

Vacant d-orbitals in elements allows transfer of electrons after unpairing electrons from s and p orbitals. D- orbitals are present in P and S due to which they can accommodate extra electrons which increases their covalency.

In excited state sulphur has a valency of six due to six unpaired electrons. Similarly in phosphorous it has a valency of 5 in the excited state due to the presence of the 5 unpaired electrons.

For example,

Sulphur configuration: 1s2 2s2 2p6 3s2 3p4

Sulphur configuration excited state: 1s2 2s2 2p63s13p33d2

Phosphorous configuration: 1s2 2s2 2p6 3s2 3p3

Phosphorous configuration excited state: 1s2 2s2 2p63s1 3p33d1

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