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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: kyasarin on December 09, 2007, 03:30:50 AM

Title: coeff * wavelength associated w/ electron transition of H 4 Li2+ ion (resolved)
Post by: kyasarin on December 09, 2007, 03:30:50 AM

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.

Title: Re: coefficient * wavelength associated with electron transition of H 4 Li2+ ion
Post by: kyasarin on December 10, 2007, 07:38:44 AM

Quote from: kyasarin on December 09, 2007, 03:30:50 AM

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?  :P