Erbium

Analytical testing dots

Erbium is a chemical element with the symbol Er and atomic number 68. A rare, silvery, white metallic lanthanide; Erbium is a solid in its normal state. A trivalent element, pure erbium metal is malleable (or easily shaped), soft yet stable in air, and does not oxidize as quickly as some other rare-earth metals.

 

General
Name, Symbol, Number erbium, Er, 68
Chemical series lanthanides
Group, Period, Block n/a, 6, f
Appearance silvery white
Standard atomic weight 167.259(3) g·mol-1
Electrons per shell 2, 8, 18, 30, 8, 2
Physical properties
Phase solid
Density (near r.t.) 9.066 g·cm−3
Liquid density at m.p. 8.86 g·cm−3
Melting point 1802K
(1529°C, 2784°F)
Boiling point 3141K
(2868°C, 5194°F)
Heat of fusion 19.90 kJ·mol-1
Heat of vaporization 280 kJ·mol-1
Heat capacity (25°C) 28.12 J·mol-1·K-1
Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 1504 1663 (1885) (2163) (2552) (3132)
Atomic properties
Crystal structure hexagonal
Oxidation states 3
(basic oxide)
Electronegativity 1.24 (Pauling scale)
Ionization energies
(more)
1st: 589.3 kJ·mol-1
2nd: 1150 kJ·mol-1
3rd: 2194 kJ·mol-1
Atomic radius 175 pm
Atomic radius (calc.) 226 pm
Miscellaneous
Magnetic ordering no data
Electrical resistivity (r.t.) (poly) 0.860 µΩ·m
Thermal conductivity (300K) 14.5 W·m-1·K-1
Thermal expansion (r.t.) (poly)
12.2 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2830 m/s
Young's modulus 69.9 GPa
Shear modulus 28.3 GPa
Bulk modulus 44.4 GPa
Poisson ratio 0.237
Vickers hardness 589 MPa
Brinell hardness 814 MPa
CAS registry number 7440-52-0

 

View the Periodic Table...

View the List of Elements...

Analytical testing dots

Content from Wikipedia for educational use and displayed with permission under the GFDL.
Please report any inaccuracies to the Webmaster.