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Erbium, 68 Erbium Pronunciation (UR -bee-əm Appearance sillery white Standard atomic weight A r, std (Er) 7002167259000000000♠ 167.259(3)[ 1] Erbium in the periodic cairt
Atomic nummer (Z ) 68 Group group n/a Period period 6 Block f-block Element category Lanthanide Electron confeeguration [Xe ] 4f12 6s2 Electrons per shell 2, 8, 18, 30, 8, 2 Pheesical properties Phase at STP solit Meltin pynt 1802 K (1529 °C, 2784 °F) Bylin pynt 3141 K (2868 °C, 5194 °F) Density (near r.t. ) 9.066 g/cm3 when liquid (at m.p. ) 8.86 g/cm3 Heat o fusion 19.90 kJ/mol Heat o vapourisation 280 kJ/mol Molar heat capacity 28.12 J/(mol·K) Vapour pressur
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1504
1663
(1885)
(2163)
(2552)
(3132)
Atomic properties Oxidation states 0,[ 2] +3 basic oxide) Electronegativity Pauling scale: 1.24 Atomic radius empirical: 176 pm Covalent radius 189±6 pm Colour lines in a spectral range Spectral lines o erbiumIther properties Naitural occurrence primordial Creestal structur hexagonal close-packed (hcp) Speed o soond thin rod 2830 m/s (at 20 °C) Thermal expansion (r.t. ) (poly) 12.2 µm/(m·K) Thermal conductivity 14.5 W/(m·K) Electrical resistivity (r.t. ) (poly) 0.860 µ Ω·m Magnetic orderin paramagnetic at 300 K Young's modulus 69.9 GPa Shear modulus 28.3 GPa Bulk modulus 44.4 GPa Poisson ratio 0.237 Vickers haurdness 589 MPa Brinell haurdness 814 MPa CAS Nummer 7440-52-0 History Diskivery Carl Gustaf Mosander (1842) Main isotopes o erbium
Decay modes in parentheses are predictit, but hae nae yet been observed | references
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C
1529
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K
1802
1802
0
F
2784
2784
0
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String Module Error: Target string is empty !
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C: 1529, K: 1802, F: 2784
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C
2868
—
—
K
3141
3141
0
F
5194
5194
0
WD
String Module Error: Target string is empty !
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C: 2868, K: 3141, F: 5194
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References
Thir references will appear in the airticle, but this list appears anerly on this page.
↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)" . Pure and Applied Chemistry 88 (3): 265–91. doi :10.1515/pac-2015-0305 ↑ Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev . 22 : 17–24. doi :10.1039/CS9932200017 .
