sp2 hybridization in ethene
In sp^2 hybridization, the 2s orbital mixes with only two of the three available 2p orbitals, forming a total of three sp^2 orbitals with one p-orbital remaining.
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"Inorganic Chemistry/Chemical Bonding/Orbital hybridization."
http://en.wikibooks.org/wiki/Inorganic_Chemistry/Chemical_Bonding/Orbital_hybridization%23sp_hybrids
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