Question

what do you mean byionisation energy?​

Answer 1

Answer:

Ionization energy is the energy required to remove an electron from a gaseous atom or ion.

Answer 2

Answer:

Ionization energy is the energy required to remove an electron from a gaseous atom or ion. The first or initial ionization energy or Ei of an atom or molecule is the energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions.