Answer Happy

The Bohr equation can be generalized to correctly predict the wavelength of light emitted or absorbed by any one-electron atom or ion, such as H, He* or Li2+. The generalized equation is AEphoton -2.18 x 10-18 J (Z²)(1/nf² - 1/n;2), where Z is the number of protons in the atom. In an H atom the transition from n = 3 to n = 2 produces a 686 nm photon. In a Het ion, the same transition (ie. n = 3 to n = 2) would produce a photon with a longer wavelength. exactly the same wavelength a shorter wavelength.