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Praseodymium |
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Pípè | /ˌpreɪziːəˈdɪmiəm/[1] (PRAY-zee-ə-DIM-ee-əm) |
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Ìhànsójú | grayish white |
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Ìwúwo átọ̀mù Ar, std(Pr) | 140.90766(1)[2] |
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Praseodymium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 59 |
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Ẹgbẹ́ | group n/a |
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Àyè | àyè 6 |
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Àdìpọ̀ | Àdìpọ̀-f |
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Ẹ̀ka ẹ́límẹ́ntì | Lanthanide |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 4f3 6s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 21, 8, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1208 K (935 °C, 1715 °F) |
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Ígbà ìhó | 3793 K (3520 °C, 6368 °F) |
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Kíki (near r.t.) | 6.77 g/cm3 |
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when liquid (at m.p.) | 6.50 g/cm3 |
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Heat of fusion | 6.89 kJ/mol |
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Heat of | 331 kJ/mol |
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Molar heat capacity | 27.20 J/(mol·K) |
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pressure
P (Pa)
|
1
|
10
|
100
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1 k
|
10 k
|
100 k
|
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at T (K)
|
1771
|
1973
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(2227)
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(2571)
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(3054)
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(3779)
|
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Atomic properties |
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Oxidation states | 0,[3] +1,[4] +2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 1.13 |
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Atomic radius | empirical: 182 pm |
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Covalent radius | 203±7 pm |
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Spectral lines of praseodymium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | hexagonal |
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Speed of sound thin rod | 2280 m/s (at 20 °C) |
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Thermal expansion | (r.t.) (α, poly) 6.7 µm/(m·K) |
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Thermal conductivity | 12.5 W/(m·K) |
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Electrical resistivity | (r.t.) (α, poly) 0.700 µ Ω·m |
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Magnetic ordering | paramagnetic [5] |
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Young's modulus | (α form) 37.3 GPa |
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Shear modulus | (α form) 14.8 GPa |
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Bulk modulus | (α form) 28.8 GPa |
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Poisson ratio | (α form) 0.281 |
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Vickers hardness | 400 MPa |
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Brinell hardness | 481 MPa |
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CAS Number | 7440-10-0 |
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Main isotopes of praseodymium |
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Àdàkọ:Category-inline | references |