Question: (a) What experimental evidence is there for the electron having a spin? (b) Draw an energy-level diagram that shows the relative energetic positions of a

(a) What experimental evidence is there for the electron having a "spin"?
(b) Draw an energy-level diagram that shows the relative energetic positions of a 1s orbital and a 2s orbital. Put two electrons in the 1s orbital.
(c) Draw an arrow showing the excitation of an electron from the 1s to the 2s orbital.

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