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Erbium (Er)
Atomic number: 68 · Category: lanthanide · Group 3 · Period 6 · Phase: Solid
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.
Atomic mass: 167.2593
Density: 9.066
Melting point: 1802 K
Boiling point: 3141 K
Appearance: silvery white
Source: Wikipedia
Block: f
Molar heat: 28.12
CPK color:#00e675
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f12
Configuration (semantic): [Xe] 4f12 6s2
Shells: 2, 8, 18, 30, 8, 2
Electronegativity (Pauling): 1.24
Electron affinity: 30.1
Ionization energies: 589.3, 1150, 2194, 4120
Periodic position
Group: 3
Period: 6
xpos: 14
ypos: 9
Spectral/Bohr images
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3D Model