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Protactinium, 91 Protactinium Pípè / ˌ p r oʊ t æ k ˈ t ɪ n i ə m / (PROH -tak-TIN -ee-əm Ìhànsójú bright, silvery metallic luster Ìwúwo átọ̀mù A r, std (Pa) 231.0358 8(1) [ 1] Protactinium ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 91 Ẹgbẹ́ group n/a Àyè àyè 7 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì Actinide Ìtò ẹ̀lẹ́ktrọ́nù [Rn ] 5f2 6d1 7s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 32, 20, 9, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1841 K (1568 °C, 2854 °F) Ígbà ìhó ? 4300 K (? 4027 °C, ? 7280 °F) Kíki (near r.t. ) 15.37 g/cm3 Heat of fusion 12.34 kJ/mol Heat of 481 kJ/mol Atomic properties Oxidation states +2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.5 Atomic radius empirical: 163 pm Covalent radius 200 pm Color lines in a spectral range Spectral lines of protactiniumOther properties Natural occurrence from decay Crystal structure orthorhombic Thermal conductivity 47 W/(m·K) Electrical resistivity 177 n Ω·m (at 0 °C) Magnetic ordering paramagnetic [ 2] CAS Number 7440-13-3 Main isotopes of protactinium
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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 . ↑ Magnetic susceptibility of the elements and inorganic compounds , in Handbook of Chemistry and Physics 81st edition, CRC press.
