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in The d and f Block Elements by (36.2k points)
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Two students wrote the electronic configuration of Chromium (Z = 24) as shown below :

Student A : [Ar] 4s2,3d4

Student B : [Ar] 4s1,3d

1. Pick out the correct electronic configuration and justify.

2. Calculate the spin only magnetic moments of Sc3+, Mn2+, Fe3+ and find out which is more paramagnetic.

1 Answer

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Best answer

(1). [Ar] 3d5 4s1

Due to the extra stability of the half-filled 3d level.

(2). Sc3+ – n = 0 µ = 0 BM

Mn2+ – n = 5 µ = \(\sqrt{5(5+2)}\) = \(\sqrt{35}\) = 5.92 BM

Fe3+ – n = 5 µ = \(\sqrt{5(5+2)}\) = \(\sqrt{35}\) = 5.92 BM

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