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

Explanation

`E _(n ) =- 2.18 xx 10^(-18 ) ((Z^2)/(n^2))` J / atom
`He ^+ ( Z =2)`
` r_(n ) = ( 52.9 (n^2))/(Z ) pm`
` E_(1) =- 8.72 xx 10 ^(-18) J`
` R_(1) = 0.0264 nm`