Find the total number of cations for which ionisation energy of cation is lower than corresponding atom `{:(K^(+).,Ne^(+).,P^(+).,S^(+).,Fe^(+).,Be^(+).,O^(+),):}`

Answer

0

Explanation

Successive I.E. always increases.
`Moverset(I.E_(1))rarrM^(+)overset(I.E_(2))rarrM^(2+)`
`I.E._(1) lt I.E._(2)`