Quick Facts Pípè, Ìhànsójú ...
Thulium, 69 Tm Thulium Pípè / ˈ θj uː l i ə m / (THEW -lee-əm ) Ìhànsójú silvery gray Ìwúwo átọ̀mù A r, std (Tm)168.9342 18(6) [1] Thulium ní orí tábìlì àyè
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) pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1117
1235
1381
1570
(1821)
(2217)
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 range Spectral lines of thuliumOther 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
Iso tope
Abun dance
Half-life (t 1/2 )
Decay mode
Pro duct
167 Tm
syn
9.25 d
ε
0.748
167 Er
168 Tm
syn
93.1 d
ε
1.679
168 Er
169 Tm
100%
169 Tm is stable with 100 neutrons
170 Tm
syn
128.6 d
β−
0.968
170 Yb
171 Tm
syn
1.92 y
β−
0.096
171 Yb
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