Successive ionisation energies are a proof for the existence of the shells in atoms.
First ionisation energy- is the energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions.
M(g) ---> M+ (g) + e-
Successive ionisation energies- are a measure of the energy required to remove each electron in turn.
There are 3…