15. Thulium (Tm) – The Rarest of the Rare
Thulium is the least abundant naturally occurring rare earth, used in portable X-ray machines.
Overview
Click on any title for content. Enjoy the read.
14. Erbium (Er) – The Fiber Optic Amplifier
Erbium is the unsung hero of the internet, used to boost signals in long-distance fiber optic cables.