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Forum Question Bank[AMU 2009] The radius of the Bohr orbit of the …

MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryAtomic StructureIntro

[AMU 2009] The radius of the Bohr orbit of the H-atom is r. Then the radius of the first orbit of Li²⁺ will be

0.r/9

1.r/3

2.3r

3.9r

Explanation

rₙ = 0.529 n²/Z Å. For H (Z=1, n=1): r = 0.529. For Li²⁺ (Z=3, n=1): r_Li = 0.529/3 = r/3.

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