ionisation energy

the first ionisation energy- The amount of energy required to remove 1 electron from every ion in mole of atomic gas, to produce a mole of uni positive gaseous ions.

the second ionisation energy- The amount of energy required to remove 1 electron from every ion in one mole of uni positive gaseous ions to produce a mole of dispositive gaseous ions.

the third ionisation energy- the amount of energy required to remove 1 electron from every ion in one mole of dispositive ions to produce a mole of tripositive gaseous ions.