If a hydrogen atom remains in its first excited level, how many times will its radius be greater than the Bohr's radius?
Correct answer: B. Four times
- A. Twice
- B. Four times
- C. Same
- D. Eight times
Explanation
In the ground state = n = 1, hydrogen has radius = r = 0.529Å. When hydrogen is in excited state = n = 2 and, as r = 0.529(n²) Å. So, the radius of hydrogen in excited state = r = 0.529(22Å) = 0.529(4) Å which is four times greater than Bohr's radius.
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