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Cr, Chromium

Wikipedia ( It is a steely-gray, lustrous, hard and brittle metal[2] which takes a high polish, resists tarnishing, and has a high melting point)
Electronic configuration: Cr 1s2 2s2 2p6 3s2 3p6 3d5 4s1 with a net moment of 6 BM?. Cr3+ has S=3/2, (Mabbs)
Magnetism: RT susceptibility 167E-6 emu/mol Ref.
Magnetic moment of Cr3+ = 3.9 BM, spin only.


Chromium(III) complexes

Mabbs: octahedral mononuclear chromium(III) has an orbital singlet ground state, S=3/2. The temperature dependent susceptibility is the same as for Co(II) complexes. Formula for X(T) in Mabbs, Machin: Magnetism and transition Metal Complexes, page 183.

ZrCr2

The hexagonal modifications of the Laves phases TiCr2, ZrCr2 and HfCr2 all exhibit Pauli paramagnetism with nearly the same susceptibility values (approx 4 × 10-4 e.m.u./mole). Measurements on the cubic modification of TiCr2 yield a slightly higher Pauli paramagnetic susceptibility (5 × 10-4 e.m.u./mole). The compounds TiCo2 and ZrCo2 form a single phase pseudo-binary system having the cubic Laves phase structure. The compounds exhibit Pauli paramagnetism with virtually constant susceptibility (1.44 to 1.53 × 10-3 e.m.u./mole) over the entire composition range. The YFe2?YCo2 system is also single phase with the cubic Laves structure. These alloys are ferromagnetic over the entire composition range. As Co is substituted for Fe in YFe2 the saturation moment increases, passing through a maximum at the composition YFe1.4Co0.6. The striking similarity to the behavior of alloys of elemental Co and Fe is pointed out. Reference, ResearchGate