AP EAMCET2006Chemistryd and f Block Elements
What is the correct order of spin only magnetic moment (in BM) of Mn ²⁺, Cr ²⁺ and V ²⁺ ?
Options
- AMn ²⁺> V ²⁺> Cr ²⁺
- BV ²⁺> Cr ²⁺> Mn ²⁺
- CMn ²⁺> Cr ²⁺> V ²⁺
- DCr ²⁺> V ²⁺> Mn ²⁺
Correct answer
C. Mn ²⁺> Cr ²⁺> V ²⁺
Step-by-step solution
Spin only magnetic moments depend upon the number of unpaired electrons, more the number of unpaired electron, greater will be the spin only magnetic moment. ₂₅ Mn =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^5, 4 s^2 Mn ²⁺=1 s^2, 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5, 4 s^0 Number of unpaired electrons =5 ₂₄ Cr =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^5, 4 s^1 Cr ²⁺=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^4, 4 s^0 Number of unpaired electrons =4 ₂₃ ~V =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^3, 4 s^2 V ²⁺=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^