Question

The energy of the second stationary state in $L{i}^{+2}$ ion is $-11.025\times {10}^{-18}J$. Find ionization energy (in $J/mole$) for $H{e}^{+}$ ions in its ground state.

Answer 1

We know that the formula for energy of hydrogen like species is

$E_n=-13.6\times \frac{Z^2}{n^2}eV$

For $H{e}^{+}\Rightarrow E=19.6\times {10}^{-18}J/atom$ ($Z=2,n=1$)