The bond order of the B2 molecule is one.
The bond order shows the number of chemical bonds present between a pair of atoms. The Bond Order Formula can be defined as half of the difference between the number of electrons in bonding orbitals and antibonding orbitals.
Nb = Number of bonding electrons
Na = Number of antibonding electrons
Bond order of B2 molecule
The atomic number of Boron (B) is 5, the electronic configuration of Boron is,
B (Z = 5) = 1s2 2s2 2p1
Bond order = 1/2 [Nb – Na]
Bond order = 1
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