Erbium

Erbium, ₆₈Er
Erbium
Pípè	/ˈɜːrbiəm/ (UR-bee-əm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(Er)	167.259(3)
Erbium ní orí tábìlì àyè
	holmium ← erbium → thulium
Nọ́mbà átọ̀mù (Z)	68
Ẹgbẹ́	group n/a
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f12 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 30, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1802 K (1529 °C, 2784 °F)
Ígbà ìhó	3141 K (2868 °C, 5194 °F)
Kíki (near r.t.)	9.066 g/cm3
when liquid (at m.p.)	8.86 g/cm3
Heat of fusion	19.90 kJ/mol
Heat of	280 kJ/mol
Molar heat capacity	28.12 J/(mol·K)
Atomic properties
Oxidation states	0, +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.24
Atomic radius	empirical: 176 pm
Covalent radius	189±6 pm
	Color lines in a spectral rangeSpectral lines of erbium
Other properties
Natural occurrence	primordial
Crystal structure	hexagonal
Speed of sound 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 ordering	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 hardness	589 MPa
Brinell hardness	814 MPa
CAS Number	7440-52-0
Main isotopes of erbium
	Àdàkọ:Category-inline; wo; ọ̀rọ̀; àtúnṣe; \| references

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Itumosi

↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna 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.