Question

the electron in this hydrogen atom is bombarded by a photon of uv radiation corresponding to the shift between n = 1 and n = 3. which of the following is not true for the atom?
the electron moves from its ground state to an excited state.
the energy of the atom remains unchanged.
a uv absorption spectrum shows a missing line that matches the wavelength of the photon.
the electron absorbs the photon and moves to the higher energy level.

Explanation:

• The ground state of hydrogen is n=1; moving to n=3 is an excited state, so the first statement is true.
• When an electron absorbs a photon, it gains energy, so the atom's energy increases, not stays unchanged.
• Absorption spectra show missing lines corresponding to photons absorbed, so the third statement is true.
• The electron absorbs the UV photon to jump to the higher n=3 energy level, so the fourth statement is true.

Answer:

The energy of the atom remains unchanged.