Question

Define Ionization energy. ?

Answer 1

Energy required to ionize 1 mol of gaseous atoms.

Explanation:

Ionization energy is the energy required to remove the outermost electrons from 1 mol atoms in gaseous state.

Alkali metals have the least Ionization energy and Noble gases have the highest.

`E(g)` `rarr` `E^+(g)` `+` `e^-` : `DeltaH =`Ionization energy

Here `E` is any element.