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Erbium

68
Er
Erby
Erbium

Erbium is named after the swedish find spot Ytterby, just like Yttrium, Terbium and Ytterbium. Apparently the chemists of that time were not very creative in naming.

Therefore Erby is the third monster of the Ytterbies.

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A piece of pure Erbium:

Erbium-crop