Using Bohr.s formula for energy quantisation, calculate the ionisation potential of ground level of `Li^(2+)` atom

Explanation

Again using `E_n = (-13.6Z^2)/(n^2) eV , `
`E_oo - E_1 = - 13.6 xx (3)^2 [ 1/oo - (1)/(1^2) ]`
` rArr E_oo - E_1 = 122.4 eV`