| Erbium
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68Er
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| Ìhànsójú
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silvery white
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| Àwọn ìdámọ́ wíwọ́pọ̀
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| Orúkọ, àmì-ìdámọ́, nọ́mbà
|
erbium, Er, 68
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| Ẹ̀ka ẹ́límẹ̀nti
|
lanthanide
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| Ẹgbẹ́, àsìkò, àdìpò
|
n/a, 6, f
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| Ìwúwo átọ́mù
|
167.259
|
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| Ìtòléra ẹ̀lẹ́ktrónì
|
[Xe] 4f12 6s2
2, 8, 18, 30, 8, 2
|
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| Physical properties
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| Phase
|
solid
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| Density (near r.t.)
|
9.066 g·cm−3 |
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| Liquid density at m.p.
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8.86 g·cm−3 |
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| Melting point
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1802 K, 1529 °C, 2784 °F
|
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| Boiling point
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3141 K, 2868 °C, 5194 °F
|
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| Heat of fusion
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19.90 kJ·mol−1
|
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| Heat of vaporization
|
280 kJ·mol−1 |
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| Molar heat capacity
|
28.12 J·mol−1·K−1 |
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| Vapor pressure
|
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| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
| | at T (K)
|
1504
|
1663
|
(1885)
|
(2163)
|
(2552)
|
(3132)
|
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| Atomic properties
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| Oxidation states
|
3 (basic oxide)
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| Electronegativity
|
1.24 (Pauling scale)
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| Ionization energies
|
1st: 589.3 kJ·mol−1 |
|---|
| 2nd: 1150 kJ·mol−1 |
| 3rd: 2194 kJ·mol−1 |
| Atomic radius
|
176 pm
|
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| Covalent radius
|
189±6 pm
|
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| Miscellanea
|
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| Crystal structure
|
hexagonal
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| Magnetic ordering
|
paramagnetic at 300 K
|
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| Electrical resistivity
|
(r.t.) (poly) 0.860 µΩ·m
|
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| Thermal conductivity
|
14.5 W·m−1·K−1 |
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| Thermal expansion
|
(r.t.) (poly) 12.2 µm/(m·K)
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| Speed of sound (thin rod)
|
(20 °C) 2830 m·s−1 |
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| Young's modulus
|
69.9 GPa
|
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| Shear modulus
|
28.3 GPa
|
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| Bulk modulus
|
44.4 GPa
|
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| Poisson ratio
|
0.237
|
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| Vickers hardness
|
589 MPa
|
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| Brinell hardness
|
814 MPa
|
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| CAS registry number
|
7440-52-0
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| Àwọn ísótòpù dídúró jùlọ
|
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| Main article: Àwọn ísótòpù erbium
|
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| · r
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