Emission and Absorption Spectra - Physical Chemistry

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Question

After undergoing emission a molecule is                      stable and after undergoing absorption a molecule is                      stable.

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Answer

Emission is the process of releasing (or emitting) photons from an atom whereas absorption is the process of absorbing photons. After emission, the atom releases energy (in the form of photons) and goes to a lower energy state. In absorption, however, the atom absorbs energy and goes to a higher energy state. Recall that lower energy always means more stable; therefore, after emission, an atom or molecule goes to a more stable state whereas after absorption it goes to a less stable state.

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