Symbol
Er
Atomic Number
68
Atomic Mass
167.259
Protons
68
Neutrons
99
Electrons
68
Type
Lanthanide
Isotopes
Erbium-162, Erbium-164, Erbium-166, Erbium-167, Erbium-168
Discovery Year
1842
Discovered By
Johan Gadolin
Group
3
Period
6
Boiling Point
2510°C
Melting Point
1529°C
Electron Configuration
[Xe] 6s² 4f¹²
Density (g/cm³)
9.066
Crystal Structure
Hexagonal
Magnetism
Paramagnetic
Abundance in Earth's Crust
0.0004%
Phase at Room Temperature
Solid