Atomic Number 68     Atomic Mass 167.26     Density 9.006 g/mL

State solid     Color silvery white     Electronegativity 1.25

Melting Point 1529°C     Boiling Point 2863°C

Natural Isotopes Er-162 0.14%   Er-164 1.61%   Er-166 33.6%
Er-167 22.95%   Er-168 26.8%   Er-170 14.9%

Abbreviated Electron Configuration [Xe] 4f¹² 6s²

Discovered by Carl Mosander in 1843.