Why does the first ionization enthalpy would have higher electron gain enthalpy?

Why Noble gases have zero electron gain enthalpy?

Which of the following pairs of elements would have higher electron gain enthalpy? (a) N or O , (b) F or Cl . Explain.

The first ionisation enthalpy of Mg is higher than the first ionisation enthalpy of:

Compared to first ionization enthalpy of an atom, the second is :

The first ionization enthalpy of the following elements are in the order:

Among the elements Li, K,Ca, S and Kr , which one is expected to have the lowest first ionization enthalpy and which one has the highest first ionization enthalpy ?

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na^(+) will be: