what is bond order?

[Smooth Operater]

what is bond order? how would calculate it? Thanks!

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[doc toothache]

Bonder order refers to the number of pairs of electrons between a pair of atoms.
bond order 1-single bond (ethane)
bond order 1.33- CO3-
bond order 1.5- benzene, O3
bond order 2-double bond-ethylene
bond order 3-triple bond -acetylene
bond order 4-quadruple bond- di-tungsten tetra(hexahydropyrimidopyrimidine)
bond order 5-quintuple bond- chromium dimers;Ar-Cr-Cr-Ar
bond order 6-sextuplet bond-transition metals