For each of the following atomic transitions, state whether the transition is allowed or forbidden, and why:
- 4p $\rightarrow$ 3p;
- 3p $\rightarrow$ 1s;
- 4d $\rightarrow$ 2d;
- 5d $\rightarrow$ 3s;
- 4s $\rightarrow$ 2p.
Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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