The difference between the radii of 3rd and 4th orbitals of Li2+ is R1. The difference between the radii of 3rd and 4th orbits of He+ is R2. Ratio R1 : R2 is : (A) 2 : 3 (B) 3 : 8 (C) 3 : 2 (D) 8 : 3

Question

The difference between the radii of 3rd and 4th orbitals of Li2+ is R1. The difference between the radii of 3rd and 4th orbits of He+ is R2. Ratio R1 : R2 is :

(A) 2 : 3
(B) 3 : 8
(C) 3 : 2
(D) 8 : 3

Prashant Kotian · Accepted Answer

Correct answer: A. r = 0.529 Z n2 Å For Li2+ n Li n Li ) r( ) r( 2      = 529 . [16 – 9] = R1 For He+ n He n He ) r( ) r(      = 529 . [16 – 9] = R2 ; 1 R R   = 2

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