Question

The energy of an electron revolving in the 3 rd orbit of Be 3+ ion ( Atomic number of Be =4) is *

Answer 1

Energy of electron in an orbit of hydrogen or hydrogen like atoms is

E = - 13.6Z²/n²

where Z is the atomic number

n means n th orbit.

Energy of electron in 3 rd orbit of Be³⁺ is = - 13.6 * (4)²/3² = - 24.18 eV(nearly)

[ atomic number of Be = 4]

Given 3rd orbit, so n = 3

Energy of electron in 3 rd orbit of Be³⁺  = - 24.18 eV