NATS 1870 Lecture Notes - Lecture 27: Chromophore, Electromagnetic Spectrum, Photon
22 Jul 2019
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Molecules and bonds- part 2: other bond types. We will focus only on some of them here. Strength of covalent bonds: covalent bonding happens when atoms share" their electrons, to fill up" their valence shells. Molecules can share different number of electrons together 1, 2, 3, 4, even 5 . The most common bonds are single and double bonds: when atoms bond together, forming a molecule, they achieve a lower-energy state, which is the preferred" state for molecules to be in. To undo" a bond, extra energy has to be put back into the atom, to be used in the breaking" of the bond. This extra energy can come from incoming light (photons): the more electrons are shared between atoms, the weaker that bond is, and so it is easier to break" it, by these electrons absorbing incoming energy. If electrons absorb a photon of particular colour (e. g. : blue), then the eye will see only the.
