Question

explain electron affinity and metallic and non metallic character

Answer 1

Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion.
metalic and non metalic character are the characters of metal and non metals such that lustre ,ductility,hardness etc

Answer 2

The change in energy of a neutral atom which is in gaseous state when an electron is added to the atom to form a negative ion is called Electron Affinity.
Metallic and non metallic characters of the metals and non metals such as ductility, lustre etc.