[kyasarin]

The wavelength of light associated with the n = 2 to n = 1 electron transition in the H spectrum is 1.216 x 10-7 m. By what coefficient should this wavelength be multiplied to obtain the wavelength associated with the same electron transition in the Li2+ ion?
a)1/9
b)1/7
c)1/4
d)1/3
e)1

I have no idea because we only covered H and the formula "∆E = 2.178 X 10-18 J[1/n2i – 1/n2f]" I have also had trouble with questions concerning this equations (see post titled "minimum wavelength to excite an electron".
So to sum it all up i am at total loss, except that I'm almost sure it is not e.

[kyasarin]

I have no idea because we only covered H and the formula "∆E = 2.178 X 10-18 J[1/n2i – 1/n2f]" ... So to sum it all up i am at total loss, except that I'm almost sure it is not e.

I just realized that Li starts w/ 3 electrons & the Li²⁺ ion has lost 2 electrons so it now only has 1 like H. So I am hypothesizing that the answer is e) 1. (which is the only one I thought is wasn't. Wow, can you tell i was doing this really late at night?