MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical 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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