Question

Explain the following
Elements os group 16 generally show lower value of first ionisation enthalpy compared to thr corresponding periods og group 15. Why?

Answer 1

Dear student

For 15th group element valence - shell electronic configuration is ns2 np3. That means the 15th group has a stable half filled p-orbital. hence lots of energy is required to remove the electron from the valence shell, means high ionisation enthalpy. whereas in case of the 16th group the valence shell is ns2 np4. So it can easily remove one electron from its valence shell to gain a stable half filled electronic configuration.

That's why 16th group generally show the lower value of first ionisation enthalpy compares to the group 15.

Regards