Magnetic Moments of Coordination Complexes

[ReidMerrill]

Homework Statement

Predict the magnetic moments (spin-only) of the following species:
a. [Cr(H₂)₆)²⁺
b. [Cr(CN)₆]^4-
c. [FeCl₄]^-
d. [Fe(CN)₆]^3-
e. [Ni(H₂O)₆]²⁺
f. [Cu(en)₂(H₂O₂)]²⁺

Homework Equations

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The Attempt at a Solution

I figured that Cr is 2+ for part A and B but I don't really know what the problem is asking. If there are any relevant formulas I'd appreciate learning them.

 

[Borek]

High and low spin complexes?