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