Neodymium (pípè /ˌniː.ɵˈdɪmiəm/ NEE -o-DIM -ee-əm ) je apilese kemika to ni ami-idamo Nd ati nomba atomu 60.
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Neodymium, 60 Nd Neodymium Pípè / ˌ n iː oʊ ˈ d ɪ m i ə m / (NEE -oh-DIM -ee-əm ) Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Nd)144.242(3) [1] Neodymium ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 60 Ẹgbẹ́ group n/a Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì Lanthanide Ìtò ẹ̀lẹ́ktrọ́nù [ Xe ] 4f4 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 22, 8, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1297 K (1024 °C, 1875 °F) Ígbà ìhó 3347 K (3074 °C, 5565 °F) Kíki (near r.t. ) 7.01 g/cm3 when liquid (at m.p. ) 6.89 g/cm3 Heat of fusion 7.14 kJ/mol Heat of 289 kJ/mol Molar heat capacity 27.45 J/(mol·K) pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1595
1774
1998
(2296)
(2715)
(3336)
Atomic properties Oxidation states 0,[2] +2, +3 , +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.14 Atomic radius empirical: 181 pm Covalent radius 201±6 pm Color lines in a spectral range Spectral lines of neodymiumOther properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 2330 m/s (at 20 °C) Thermal expansion (r.t. ) (α, poly) 9.6 µm/(m·K) Thermal conductivity 16.5 W/(m·K) Electrical resistivity (r.t. ) (α, poly) 643 n Ω·m Magnetic ordering paramagnetic , antiferromagnetic below 20K [3] Young's modulus (α form) 41.4 GPa Shear modulus (α form) 16.3 GPa Bulk modulus (α form) 31.8 GPa Poisson ratio (α form) 0.281 Vickers hardness 343 MPa Brinell hardness 265 MPa CAS Number 7440-00-8 Main isotopes of neodymium
Iso tope
Abun dance
Half-life (t 1/2 )
Decay mode
Pro duct
142 Nd
27.2%
142 Nd is stable with 82 neutrons
143 Nd
12.2%
143 Nd is stable with 83 neutrons
144 Nd
23.8%
2.29× 1015 y
α
1.905
140 Ce
145 Nd
8.3%
145 Nd is stable with 85 neutrons
146 Nd
17.2%
146 Nd is stable with 86 neutrons
148 Nd
5.7%
148 Nd is stable with 88 neutrons
150 Nd
5.6%
6.7× 1018 y
β− β−
3.367
150 Sm
Àdàkọ:Category-inline | references
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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 . Gschneidner, K.A., and Eyring, L., Handbook on the Physics and Chemistry of Rare Earths, North Holland Publishing Co., Amsterdam, 1978.