Solveeit Logo

Question

Question: What electronic transition in Li<sup>2+</sup> produces the radiation of same wavelength as the first...

What electronic transition in Li2+ produces the radiation of same wavelength as the first line in the Balmer’s series of Hydrogen spectrum-

A

n2 = 3 to n1 = 2

B

n2 = 6 to n1 = 3

C

n2 = 9 to n1 = 6

D

n2 = 9 to n1 = 8

Answer

n2 = 9 to n1 = 6

Explanation

Solution

First line in balmer series means transition from n = 3 to n = 2. Now, 9th orbit of Li2+ has same energy as third orbit of 'H' atom & 6th orbit of Li2+ has same energy as second orbit of 'H' atom. So n = 9 to n = 6 transition in Li2+ would have same wavelength as first line in balmer series of H–spectrum.