Promethium

http://en.wikipedia.org/wiki/Promethium

Field Hierarchy

Parent
Europium 20.7k papers	Erbium 17.8k papers	Neodymium 14.9k papers	Ytterbium 14.7k papers
Terbium 9,084 papers	Thulium 5,545 papers	Holmium 5,527 papers
Current
Promethium papers
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Trends

Notes

History