Tag Archives: Marc Delafontaine

Holmium, I, Atomic number 67

General Holmium is a chemical element with the element symbol Ho and atomic number 67. In the periodic table it is in the group of lanthanides and is thus also one of the rare earth metals. 1878 discovered the Swiss chemist Marc Delafontaine … Continue reading

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Erbium, He, Atomic number 68

General Erbium is a chemical element with atomic symbol He and atomic number 68. In the periodic table it is in the group of lanthanides and is thus also one of the rare earth metals. The name derives from the pit … Continue reading

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