alleryBohr radius for hydrogen is 0.53 Å. Radius of 3rd orbit:
A1.59 Å
B2.65 Å
C0.59 Å
D4.77 Å (= 9 × 0.53)
Answer & Solution
Correct answer: D. 4.77 Å (= 9 × 0.53)
r_n = n² × a₀.
n=3: r = 9 × 0.53 = 4.77 Å.
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