A Double Bond as Sigma Plus Pi
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A double bond consists of exactly one sigma bond from hybrid-orbital overlap plus one pi bond from leftover unhybridized p-orbital overlap.
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Ethylene's carbon-carbon double bond is one sp²-sp² sigma bond plus one pi bond from the remaining unhybridized p orbitals.
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A double bond's second bond is always a pi bond, never a second sigma bond; two atoms share only one overlap axis.