lanthanide

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Erbium

68
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.

Promethium

61
Promet
Promethium

Promethium was named after Prometheus, one of the titans of greek mythology, who brought fire to mankind. The gods then punished him by binding him to a rock in the Caucasus. There an eagle came every day eating his liver, which always grew back.

The name was chosen as a warning to humankind, since this element is radioactive as a product of decay of uranium. By the time of the discovery the nuclear arms race between the USA and the Sovied Union had begun.

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