Date of Discovery: 1843
Discoverer: Carl Mosander
Name Origin: Ytterby (a town in Sweden)
Uses: Ceramics
Obtained From: Heavier rare earth minerals

 
Atomic Number: 68
Atomic Mass: 167.26 amu
Melting Point: 1522.0 °C (1795.15 °K, 2771.6 °F)
Boiling Point: 2510.0 °C (2783.15 °K, 4550.0 °F)
Crystal Structure: Hexagonal
Density @ 293 K: 8.795 g/cm3
Color: Grayish

 
Isotope
Er-162
Er-164
Er-166
Er-167
Er-168
Er-169
Er-170
Er-171
Er-172
Half Life
Stable
Stable
Stable
Stable
Stable
9.4 days
Stable
7.5 hours
2.1 days