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Posted by **Alyssa** on Saturday, November 3, 2012 at 1:00pm.

An electron in Li2+ falls from n = 2 to the ground state. Calculate the wavenumber, (νˉ), of the emitted photon.

- Chemistry -
**DrBob222**, Saturday, November 3, 2012 at 2:34pm1/wavelength = wave number = 9*1.09737E7(1/1 - 1/4) =

That comes from

1/wavelength = RZ^2(1/n1^2 - 1/n2^2)

n1 = 1 and 1^2 = 1

n2 = 2 and 2^2 = 4

R = 1.09737E7

Z = atomic number = 3^2 = 9

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