Question

According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to.

• A. $Z^{2}n^{2}$
• B. $\frac{Z^{2}}{n^{2}}$
• C. $\frac{Z^{2}}{n}$
• D. $\frac{n^{2}}{Z}$

Answer 1

Answer: (D)

$\frac{n^{2}}{Z}$

Answer 2

$r = \frac{\varepsilon_{0}n^{2}h^{2}}{\pi Zme^{2}};\mspace{6mu}\mspace{6mu}\therefore r \propto \frac{n^{2}}{Z}$