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At what atomic number would a transition...

At what atomic number would a transition from `n=2"to"n=1` energy level result in emission of photon of `lambda= 3xx10^(-8)m`?

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The correct Answer is:
`z=2`
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RESONANCE-NUCLEAR CHEMISTRY-Exercise-1
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  18. Which of the following sets of quantum numbers are impossible for elec...

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