Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicon?

The first ionisation enthalpy is the least in

The family of elements with the highest ionisation enthalpy:

Analyse the following graph between ionisation enthalpy and atomic number.

Gallium has higher ionisation enthalpy than aluminium. Explain why?

Ionisation is the removal of electron from an.atom. What is ionisation enthalpy? How is it related to electronic configuration of atoms.

Which has higher value for 1st ionisation enthalpy - oxygen or nitrogen. Why?

Does the ionisation enthalpy decreases along a group ? Give reasion

The energy released during the addition of an electron to an isolated neutral atom is called electron gain enthalpy. a) Explain how electron gain enthalpy differ from electronegativity. b) The second ionisation enthalpy of an element is always greater than the first ionisation enthalpy. Give reason.