68 Er 167.2593

Erbium

LANTHANIDE

Phase: Solid

Discovered: Carl Gustaf Mosander

Block: F

Summary

Erbium is a chemical element in the lanthanide series, with symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements on Earth. As such, it is a rare earth element which is associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden, where yttrium, ytterbium, and terbium were discovered.

Appearance: silvery white

Source: Wikipedia

Physical Properties

Atomic Mass 167.2593 u

Density 9.066 g/cm³

Melting Point 1802 K

Boiling Point 3141 K

Molar Heat 28.12 J/(mol·K)

Electron Affinity 30.1 kJ/mol

Ionization Energies

1^st: 589.3 kJ/mol

2^nd: 1150 kJ/mol

3^rd: 2194 kJ/mol

4^th: 4120 kJ/mol