The radius of the first Bohr orbit of hydrogen is 0.053 nm. What is the radius of the third orbit (rₙ = n²r₁)?
Correct answer D. 0.477 nm
Explanation
rₙ = n²r₁, so r₃ = 9 × 0.053 = 0.477 nm. Multiplying by 3 instead of 9 gives the wrong value 0.159 nm.
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