Verified Solution • 2025–26 Session moderate

QJEEM20Chc084: JEE Main 2020 Chemistry - Class 12 JEEM20Chc084 Solution: The correct electronic configuration and spin-only magnetic…

The correct electronic configuration and spin-only
magnetic moment (BM) of Gd3+ (Z = 64), respectively, are :

Multiple Choice Options

  • A [Xe]5f7 and 8.9
  • B [Xe]4f7 and 7.9
  • C [Xe]5f7 and 7.9
  • D [Xe]4f7 and 8.9

Step-by-Step Verified Solution

Gd3+ (Z = 64) = [Xe] 4f7

Magnetic moment ( μ\mu ) = n(n+2)\sqrt {n\left( {n + 2} \right)} B.M

= 7(7+2)\sqrt {7\left( {7 + 2} \right)}

= 7.9 B.M

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