Question

Consider the spectral line resulting from the transition n = 2 to n = 1 in the atoms and ions given below. The shortest wavelength is produced by

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

Answer 1

The correct option is D di-ionized lithium

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