According to the Bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level?

Moving from the second energy level to the third requires the electron to gain energy, so energy is absorbed. When it falls back to the second level, it releases that energy as light, producing an emission line. Therefore, the correct choice is C, “Energy is absorbed and then released to form an emission line.”

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