Question: a. Is a 4p 4s transition allowed in sodium? If so, what is its wavelength (in nm)? If not, why not? b. Is a

a. Is a 4p → 4s transition allowed in sodium? If so, what is its wavelength (in nm)? If not, why not?
b. Is a 3d → 4s transition allowed in sodium? If so, what is its wavelength (in nm)? If not, why not?

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