The molecular formula of ethene is C2H4
Electronic configuration of C is ground state – 1s2 2s2 2p2
Electronic configuration of C is excited state – 1s22s12p3
Valence orbital representation
sp2 hybridization involves 2 carbon atoms combines with 4 atoms of hydrogen.
In ethane molecule, there is 5 sigma and 1 pi bond. The angle of sp2 hybridized ethane is 120°.