Chemistry

Problem

Which of the following expressions gives the radius

r_n

of the

n

th orbit of an electron in a hydrogen-like atom of atomic number

Z

in terms of the Bohr radius

a_0

? a)

r_n = \dfrac{a_0 n^2}{Z}

r_n = a_0 Z n^2

r_n = \dfrac{a_0 n}{Z^2}

r_n = \dfrac{a_0}{Z n^2}