Heteronuclear Diatomics
, *2pz
*2px,*2py
M.O.Energy Level
Diagram for A2 2p
2p
(A = O )
2px,2py
2pz
“No mixing of 2s and 2p” *2s
2s 2s
2s
A A2 A
O2 Electronic configuration:s2*s2pz2px2py2*px1*py1
Note Hund's rule again! Bond order = (8 - 4)/2 = 2
(double bond) and PARAMAGNETIC.
V.B. theory could not explain paramagnetism.