Atomic StructureHard
Question
An ion Mna+ has the magnetic moment equal to 4.9 BM. The value of a is : (atomic no. of Mn = 25)
Options
A.3
B.4
C.2
D.5
Solution
= 4.9∴ No. of unpaired electrons, n = 4.
25Mn : [Ar]4s23d5
For having 4 unpaired electrons, a Mn atom should lose 3 electrons (2 from 4s and 1 from 3d).
∴ a = + 3.
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