If the first ionization energy of hydrogen is E, then the ionization energy of He+ would be?

Q. If the ionization energy of hydrogen is 13.6 eV, then the ionization energy for${He}^{+}$ ion will be

Q. If the ionization energy for hydrogen atom is $13.6eV$, then the ionization energy for ${He}^{+}$ ion should be:

Q. If the first ionization energy of $He$ atom is $13.6eV$, then the second ionization energy of $He$ atom is :

Q. The ionization energy of hydrogen is $13.6eV$. The first ionization energy of $He$ is $24.6eV$. Calculate the energy given out when $H{e}^{2+}$ nucleus combines with two electrons to form a helium atom in ground state.

Q. The first ionization energy for $Na$ is $495kJ/mol$.
The BEST estimate for sodium's second ionization energy would be