Question

In the following atoms and molecules for the transition from n = 2 to n = 1, the spectral line of minimum wavelength will be produced by

• A. Hydrogen atom
• B. Deuterium atom
• C. Uni-ionized helium
• D. double -ionized lithium

Answer 1

The correct option is D double -ionized lithium

$\frac{1}{\lambda }=R{Z}^2(\frac{1}{1^2}-\frac{1}{2^2})$
For double-ionised lithium the value of Z is maximum.