Question

The ratio of radii of first orbit of $H$, $H{e}^{+}$ and $L{i}^{2+}$ is:

• A. 1 : 2 : 3
• B. 6 : 3 : 2
• C. 1 : 4 : 9
• D. 9 : 4 : 1

Answer 1

The correct option is B 6 : 3 : 2

$\text{Radius of H-like species}=\frac{n^2}{Z}\times 0.529\stackrel{\circ }{A}{r}_H:r_{H{e}^{+}}:r_{L{i}^{2+}}\Rightarrow 1:\frac{1}{2}:\frac{1}{3}\Rightarrow 6:3:2$