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For which of the following species is Bohr's atomic model applicable?

1. Li+
2. H
3. Li²+
4. He+

Correct answer: He+

Solution

Bohr's model is valid for one-electron (hydrogen-like) species. H, Li²+, and He+ each have exactly one electron, so Bohr's model applies to all three. Li+ has two electrons, so it is not hydrogen-like.

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