Answer
Please see the work below .
Work Step by Step
We know that total electrons
$2\times 2-1=3$
The electronic configuration is $(\sigma1s)^2(\sigma 1s^\star)^1$
Bond order
$\frac{1}{2}(n_b-n_a)$
We plug in the known values to obtain:
$\frac{1}{2}(2-1)=\frac{1}{2}$
Thus, the $He^{+2}$ ion is considered to be stable.