The ionization energy for a hydrogen atom is . The required energy to excite it from the ground stat — Atomic Structure Chemistry Question

💡 Solution & Explanation

The energy of the ground state ($n=1$) is $-13.6 \text{ eV}$ and the first excited state ($n=2$) is $-3.4 \text{ eV}$. The excitation energy is $\Delta E = -3.4 - (-13.6) = 10.2 \text{ eV}$.