Calcultte the enrgy required for the process ,
` He^+ (g) rarr He^(2+) (g) + e`
The ionization energy for the H-atom in the grounds state is ` 2. 18 xx 10 ^(-18) J "atom"^(-1)`.

Answer

A

Explanation

`E_(1)` of H atom `= - IE = - 2.18 xx 10^(-18) J`
`E_(1)` of H^(o+) = `E_(1)(H) xx Z^(2) = - 2.18 xx 10^(-18) xx 2^(2)J`
`=8.72 xx 10^(-18) J`
The given process represents ionisation of `He^(o+)`
The energy required for ionisation of `He^(o+) = - E_(1) (He) = 8.72 xx 10^(-18) J`