Why Noble gases have zero electron gain enthalpy?

Noble gases have _____electron affinity

Why does the first ionization enthalpy would have higher 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 second electron gain enthalpy of oxygen is

Noble gases have large positive values of electron gain enthalpy. Why ?

Noble gases have very high ionisation enthalpy. Why ?

What do you mean by the term electron gain enthalpy? How does electron gain enthalpy change along a period and in a group?

Which of the following will have most negative electron gain enthalpy? P,S,Cl,F

Which of the following electronic configurations corresponds to elements with largest negative electron gain enthalpy?