Gadolinium

Atomic # = 64
Atomic weight = 157.25

Gadolinium complexes are ingested by people to help with medical imaging in MRI’s.  The formula for two of these complexes is C₁₆H₂₅GdN₄O₈ (Dotarem) and C₂₈H₅₄GdN₅O₂₀ (Magnevist).

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