CHEM 151 Lecture Notes - Electromagnetic Spectrum, Rotational Energy, Covalent Bond

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4 May 2018

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Molecular Transitions (pg 95-96)

• Molecules exist in quantized energy states, vibrational and rotational

energy states

• Electrons play a central role in keeping atoms together in a molecule

• Changes in the EM spectrum can break bonds and cause atom separation

• Example: radiation in the UV and visible regions of the EM spectrum tends

to induce electron excitations

• Lower frequency, lower energy (vise versa)

Covalent Bonding ( pg 102-104)

• When two atoms get in close proximity of each other, the electrostatic

attraction between electrons located between the atoms and the protons

in each of the atomic nuclei leads to a net attractive force between the two

atoms

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