The 14 MO's of Ethylene: σ and π

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#1 M.O. [1s, σ, occupied]	#2 M.O. [1s, σ, occupied]	#3 M.O. [σ, occupied]	#4 M.O. [σ, occupied]
#5 M.O. [σ, occupied]	#6 M.O. [σ, occupied]	#7 M.O. [σ, occupied]	#8 M.O. [π, occupied]
#9 M.O. [π, unoccupied]	#10 M.O. [σ, unoccupied]	#11 M.O. [σ, unoccupied]	#12 M.O. [σ, unoccupied]
#13 M.O. [σ, unoccupied]	#14 M.O. [σ, unoccupied]	The green boxes are occupied MO's; the red ones unoccupied. The π-MO's, #8 and #9, are the most important to us.	Each carbon has 5 AO's; each hydrogen 1 AO. For ethylene, C2H4, 5 +5 + (4 x 1) = 14 MO's.