A \( r_n = n \times 0.53 \text{ Å} \)
B \( r_n = n^2 \times 0.53 \text{ Å} \)
C \( r_n = \frac{0.53}{n^2} \text{ Å} \)
D \( r_n = \frac{0.53}{n} \text{ Å} \)
Correct Answer: Option B
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