Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all three are high spin systems. (Atomic numbers: Ce=58, Gd=64, Eu=63)
(a)
(b)
(c)

Question

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all three are high spin systems. (Atomic numbers: Ce=58, Gd=64, Eu=63)
(a) 
(b) 
(c)

Canvas Classes · Accepted Answer

Strategy:
 Find the number of unpaired -electrons for each lanthanide ion to determine their relative magnetic moments.

Step 1: Determine the ions and configurations
- (a)  in :  is . Losing 4 electrons leaves a  core.  (diamagnetic).
- (b)  in :  is . Losing 3 electrons leaves .  (maximum paramagnetism here).
- (c)  in :  is . Losing 3 electrons leaves . .

Step 2: Order by unpaired electrons
.
Increasing order is (a) < (c) < (b).

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