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Chemistry, 23.12.2019 23:31 sudotoxic

One of the emission spectral lines for be3+ has a wavelength of 253.4 nm for an electronic transition that begins in the state with n=5. what is the principal quantum number of the lower-energy state corresponding to this emission?

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One of the emission spectral lines for be3+ has a wavelength of 253.4 nm for an electronic transitio...
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