Caculate the energy associated with the first orbit of `He^(+)` .What is the radius of this orbit ?

Explanation

Election configuration of `He^(+) = 1s^(1)`
energy of `n^(th)` orbit possessing one `vec ( e) = E_(B)`
for `He^(+) =n =1 ` and z=2
The radius of the orbit r=` ((0.0529 nm) n^(2))/( Z)`
for `He^(+)` so `1s^(1) ` and `n=1 z=2 `
`r_(1) = (0.0529 nm (1)^(2))/( 2 )`
`=0.0264 nm`
`52.9 pm = 0.0529` nm
`1pm = 10^(3) nm`