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In organic chemistry sigma bonds (Ï) are always the first bond between two atoms, resulting from overlap along the bonding axis (of hybrid orbitals), while pi bonds (Ï) are second and third bonds resulting from the overlap of p orbitals, above and below (or in front and back of) the bonding axis.
The middle nitrogen has two sigma bonds and one pi bond. is used in the double bond and two sp2 orbitals are involved in the sigma bond. leaves one sp2 orbital for the lone pair to occupy. The oxygen is involved in one pi bond and one sigma bonds.