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What does "delocalization" of electrons mean? I know that they have to do with resonance, but I'm having trouble trying to figure out what it actually means in context. If someone could explain it to me in a simpler way I'd appreciate it. Thanks!
Delocalization is spreading the electron density over a larger area, having a stabilizing effect on molecules. Essentially, this means the electrons move between atoms and don't stay around one particular one. As a result, this spreads out charges.
Essentially, electron delocalization means that electrons are not confined inside the space of one bond. For example, in benzene, the electrons in the C-C bonds are not static, but rather they move around all C-C bonds because benzene displays hybrid resonance.
"Delocalized electrons" speak to the fact that electrons have wave-like properties as well as particle-like properties. Delocalized essentially means that the electrons are in constant movement around the atoms involved in bonding rather than in rigid "orbitals" around a give atom involved in bonding.
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