67

This number is a prime.

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Holmium (atomic number 67) has the highest magnetic moment (10.6 μB) of any naturally occurring element, and is eleventh in the Lanthanide row (a.k.a. "rare earth metals") of the periodic table. [Harrison]

Submitted: 2026-10-31 18:35:32; Last Modified: 2026-10-31 20:36:56.