Question

What is a ionisation energy​

Answer 1

`~~~~~~~~~~~~~~~\large{\sf{\underbrace{\underline{\color{indigo} Ionization ~Energy}}}}`

Ionization Energy is the amount of energy required to liberates the most loosely bounds electrons from the outermost shell of an isolated gaseous atom of an element.

Answer 2

Ionisation energy:-

Ionisation energy is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule...