Question

why electron affinity of inert gas is positive?

Answer 1

This is because all of the Noble Gases have complete valence electron shells. They have a complete set of 8 electrons.

Think of 8 as being the best car that everyone wants. Most elements 'want' to have a complete electron shell with 8 electrons. Since the Noble Gases already have that 'perfect status' then they have an affinity of 0.

Affinity is the change in energy of the atom when an electron is added. Noble Gases are at the perfect number of 8 electrons. They don't 'want' anymore electrons, so there's zero change in the energy of the atom.

p.s. This is also why they are the least reactive elements on the table.

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Answer 2

Due to unlike ionisation enrgy, which are always positive for a neutral atom bcz energy is required to remove an electron to isolated gaseous atom...
and the process will be Exothermic!!!