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Calculate the wavelength of the light that is absorbed for the electron's transition from n = 5 to n = 6 in Be3+ ion. (ans in nm.)

c:3.00E8 m/s
h:6.63E-34 Js
R:2.18E-18 J

I am not sure is Be Z = 4 or Z = 3.
Could you show me the steps of how you solve this problem please?

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