Thulium

Thulium, ₆₉Tm
Thulium
Pípè	/ˈθjuːliəm/ (THEW-lee-əm)
Ìhànsójú	silvery gray
Ìwúwo átọ̀mù Ar, std(Tm)	168.934218(6)
Thulium ní orí tábìlì àyè
	erbium ← thulium → ytterbium
Nọ́mbà átọ̀mù (Z)	69
Ẹgbẹ́	group n/a
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f13 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 31, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1818 K (1545 °C, 2813 °F)
Ígbà ìhó	2223 K (1950 °C, 3542 °F)
Kíki (near r.t.)	9.32 g/cm3
when liquid (at m.p.)	8.56 g/cm3
Heat of fusion	16.84 kJ/mol
Heat of	247 kJ/mol
Molar heat capacity	27.03 J/(mol·K)
Atomic properties
Oxidation states	+2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.25
Atomic radius	empirical: 176 pm
Covalent radius	190±10 pm
	Color lines in a spectral rangeSpectral lines of thulium
Other properties
Natural occurrence	primordial
Crystal structure	hexagonal
Thermal expansion	(r.t.) (poly); 13.3 µm/(m·K)
Thermal conductivity	16.9 W/(m·K)
Electrical resistivity	(r.t.) (poly) 676 n Ω·m
Magnetic ordering	paramagnetic at 300 K
Young's modulus	74.0 GPa
Shear modulus	30.5 GPa
Bulk modulus	44.5 GPa
Poisson ratio	0.213
Vickers hardness	520 MPa
Brinell hardness	471 MPa
CAS Number	7440-30-4
Main isotopes of thulium
	Àdàkọ:Category-inline; wo; ọ̀rọ̀; àtúnṣe; \| references

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Itokasi

↑ 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.