Question

What is ionisation and ionisation potential?​

Answer 1

The ionization energy or ionization potential is the energy necessary to remove an electron from the neutral atom. It is a minimum for the alkali metals which have a single electron outside a closed shell. It generally increases across a row on the periodic maximum for the noble gases which have closed shells.

Answer 2

Actually the both words mean same . though if we go in depth . Ionisation energy is the minimum energy required to remove an electron from isolated neutral gaseous atom . and Ionisation potential means the maximum energy a electron can take with out being removed.....