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| Ìfarahàn |
| bright, silvery metallic luster |
| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
protactinium, Pa, 91 |
| Ìpè |
/ˌproʊtækˈtɪniəm/
PROH-tak-TIN-ee-əm |
| Ẹ̀ka apilẹ̀sẹ̀ |
actinide |
| Àdìpọ̀, ìgbà, block |
n/a, 7, f |
| Ìwúwo átọ́mù |
231.03588 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Rn] 7s2 6d1 5f2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 20, 9, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
15.37 g·cm−3 |
| ojúàmì ìyọ́ |
1841 K, 1568 °C, 2854 °F |
| ajúàmì ìhó |
? 4300 K, ? 4027 °C, ? 7280 °F |
| Heat of fusion |
12.34 kJ·mol−1 |
| Heat of vaporization |
481 kJ·mol−1 |
| Atomic properties |
| Oxidation states |
2, 3, 4, 5
(weakly basic oxide) |
| Electronegativity |
1.5 (Pauling scale) |
| Ionization energies |
1st: 568 kJ·mol−1 |
| Atomic radius |
163 pm |
| Covalent radius |
200 pm |
| Miscellanea |
| Crystal structure |
orthorhombic |
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(0 °C) 177 nΩ·m |
| Thermal conductivity |
(300 K) 47 W·m−1·K−1 |
| CAS registry number |
7440-13-3 |
| Most stable isotopes |
| Main article: Isotopes of protactinium |
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Protaktiníọ̀m tabi Protactinium je apilese kemika to ni ami-idamo Pa ati nomba atomu 91.
