Energy of an electron in a particular orbit of single electron species of beryllium is the same as the energy of an electron in the ground state of hydrogen atom . Identify the orbit of beryllium

Options

A. 1
B. 2
C. 3
D. 4

Explanation

Energy of an electron in `Be^(+3)` ion = `(-13.6)/(n^2)xx4^2ev`
Energy of the electron in ground state hydrogen atom = -13.6 ev
`therefore(-13.6)/(n^2)xx4^2=-13.6`
`rArrn^2=42`
`n=42`