What happens when an electron gains energy ?

What happens when an electron jumps from a lower energy level to a higher energy level?

What happens, when an electron. is in excited state ?

What happens when an electron hits a zinc sulphide screen and what does it prove?

a) On moving down a group what happens to electron gain enthalpy? b) Why chlorine shows more negative electron gain enthalpy than fluorine?

What happens to the free electrons when the conductor are connected to the battery ?

What are the units of electron gain enthalpy or electron affinity value ?

What happens to electrostatic potential energy of a two electron system, if one electrons brought towards another electron?