Which of the following species will produce the shortest wavelength for the transition `n = 2` to `n= 1` ?

Options

A. H-atom
B. D-atom
C. `He^+` ion
D. `Li^(2+)` ion

Answer

D

Explanation

`Delta` for `Li(2+) = E_2 - E-1` is maxium as
` E_(nLi^(2+)) = E_(nh) xx Z^2`.