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Each question is provided with 4-alternative answers. One or more than one of them are correct answers. Indicate the correct answer by A,B,C,D.
By the $$(n + l)$$ rule, a lower $$n + l$$ means lower energy. The values are $$3d \to 5$$, $$4s \to 4$$, $$4p \to 5$$ and $$5s \to 5$$. The $$4s$$ electron has the smallest $$n + l$$, so it has the least energy.
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