16. Ytterbium (Yb) – The Steel Improver & Clock Keeper
Ytterbium is used in metallurgy for stainless steel and in the world’s most accurate atomic clocks.
Overview
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15. Thulium (Tm) – The Rarest of the Rare
Thulium is the least abundant naturally occurring rare earth, used in portable X-ray machines.
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.