The figure shows the lowest six energy levels of the outer electron in sodium. In the ground

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The figure shows the lowest six energy levels of the outer electron in sodium. In the ground state, the electron is in the “3s” level. 

(a) What is the ionization energy of sodium? 

(b) What is the wavelength of the radiation emitted in the transition from the 3d to the 3p level?
(c) What is the transition that gives rise to the characteristic yellow light of sodium at 589 nm?

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