Question

If $13.6eV$ energy is required to ionize the hydrogen atom, then the energy required to remove an electron from $n=2$ is

• A. $10.2eV$
• B. $0eV$
• C. $3.4eV$
• D. $6.8eV$

Answer 1

The correct option is C $3.4eV$

Energy of hydrogen $E_n=\frac{-13.6\times Z^2}{n^2}$

So for $n=2$, $E=-3.4eV$

So, energy required is $3.4eV$.