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wavelength of the photon emitted. Please give your answer in units of nm, rounded to one...

wavelength of the photon emitted. Please give your answer in units of nm, rounded to one decimaA triply ionised beryllium atom (Be+++, Z = 4) has only one electron in orbit about the nucleus. If the electron decays from the n = 3 level to the first excited state (n = 2), calculate the l place.

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