Question

The addition of an electron to chlorine is an exothermic process whereas the addition of an electron to Argon is an endothermic process.Give reason

Answer 1

chlorine is formed into an ion with negative charge and

Answer 2

As Cl is electronegative element so it will pull e- easily so heat is evolved but Ar is a Noble gas with full octate..so it will consume a lot energy to accept a electron.