What is the radius of 3rd orbit of electron in H- atom.
Correct answer: B. 4.761A
- A. 3.39A
- B. 4.761A
- C. 5.29 x 10^11 A
- D. 9.7A
Explanation
The radius of an electron orbit in a hydrogen atom can be calculated using the Bohr model, which gives the radius of the nth orbit as:rn = n² × 0.529 Åwhere n is the principal quantum number.For the 3rd orbit, n = 3, so:r₃ = 3² × 0.529 Å= 9 × 0.529 Å= 4.76 Å
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