Calculate the bond order of He^2 + ​.

Bond order can be calculated using formula

$$Bond\,order=\frac{1}{2}\left ( a-b \right )$$

where

a = Number of electrons in bonding molecular orbitals.

b = Number of electrons in antibonding molecular orbitals.

The elctronic configuration of He2+ is

He2+ = σ1s2 σ*1s1

Number of electrons in bonding molecular orbitals (a) = 2

Number of electrons in antibonding molecular orbitals (b) = 1

Bond order = 1/2 (2 – 1)

Bond order = 1/2

Bond order = 0.5