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The answer is false. Electromegnatic waves are a kind of energy. Due to the conservation of energy, it's even impossible for energy of atom to stay the same when emitting electromagnetic waves if no other kind of energy is put in.
Wu is correct. When electrons in an atom move from a higher state to a lower one (when electromagnetic radiation is emitted), they emit energy; and thus, the energy of the atom does not increase but rather decreases. On the other hand, the energy of an atom increases when it absorbs electromagnetic radiation.
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