Question

EXPLAIN WHY SULPHUR HAS LESS IONISATION ENTHALPY THAN PHOSPHORUS ?

Answer 1

Ionisation enthalpy of phosphorus is greater than sulphur because the phosphorus has stable half filled electronic configuration i.e 3p3 but sulphur do not have stable configuration. So it loses one electron more easily than phosphorus.

Answer 2

Half filled and full filed have higher ionisation enthalpy.So by this we can say that sulphur is partially filled and phosphorus is half filled so phosphorus has high ionisation enthalpy than sulphur