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The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 Å. The radius for the first excited state (n = 2 orbit) is (in Å):

1. 0.13
2. 1.06
3. 4.77
4. 2.12

Correct answer: 1.06

Solution

The radius of the Bohr orbit is proportional to n². For n = 2, the radius becomes 4 times the ground state radius (0.530 Å), which is 1.06 Å.

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