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Gadolinium `(Gd)` has `4f^(7) 5 d^(1) 6s^(2)` electronic configuration outside the [Xe] core. Find spin magnetic moment of `Gd^(3+)`
A. `sqrt(63) B.M`
B. `sqrt(35) B.M`
C. `sqrt(48) B.M`
D. `sqrt(24) B.M`

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Best answer
Correct Answer - A
`4f^(7)` have seven unparied `e^(-)`.
`sqrt(7 (7 + 2)) B.M`

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