The electronic transition from n = 2 to n = 1 will produce shortest wave length in (where n = principle quantum state)

Options

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

Answer

A

Explanation

`(1)/(lambda) = Z^(2)R_(H)[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))], n_(1) = 1, n_(2) = 2`
`:. (1)/(lambda) =Z^(2) R_(H)[(1)/(1)-(1)/(4)] = (3)/(4)Z^(2) R_(H)`
or `lambda prop (1)/(Z^(2)) :. Li^(2+)` will produce shortest wave length.