Homonuclear diatomic molecules of second-period elements B 2 , C 2 , and N 2 :
vv vv r r v r r v1122222 2 2 2ssssppp p p p<* < <* < yzx==< <*y* <*z x
For O 2 and F 2 :
vv vv v r r r r v1122222 2 2 2ssssppp p p p<* < <* < xy z< ==<*y* <*z x
Covalent Bonding