erbium

** Erbium **
By Max Parry

Atomic number- 68 Atomic symbol- er Atomic mass- 167.26 Melting point- 1529 C Boiling point- 2868 C Density- 9.07 grams per cubic centimeter Name- for the village of Ytterby, Sweden. Estimated Crustal Abundance- 3.5 milligrams per kilogram Discovered- in a quarry near the town of Ytterby, Sweden when was it discovered- In 1843, Carl Gustaf Mosander, a Swedish chemist