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The ground state energy of hydrogen atom is −13.6 eV. When its electron is in the first excited state, its excitation energy is

1. 3.4 eV
2. 6.8 eV
3. 10.2 eV
4. 0

Correct answer: 10.2 eV

Solution

The excitation energy is the energy required to move the electron from the ground state to the first excited state. The energy of the first excited state is −3.4 eV, so the difference is 13.6 − 3.4 = 10.2 eV.

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