Protaktiníọ̀m

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Protactinium
91Pa
Pr

Pa

(Uqu)
thoriumprotactiniumuranium
Ìhànsójú
bright, silvery metallic luster
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà protactinium, Pa, 91
Ìpèlóhùn /ˌproʊtækˈtɪniəm/
PROH-tak-TIN-ee-əm
Ẹ̀ka ẹ́límẹ̀nti actinide
Ẹgbẹ́, àsìkò, àdìpò n/a7, f
Ìwúwo átọ́mù 231.03588
Ìtòléra ẹ̀lẹ́ktrónì [Rn] 7s2 6d1 5f2
2, 8, 18, 32, 20, 9, 2
Physical properties
Phase solid
Density (near r.t.) 15.37 g·cm−3
Melting point 1841 K, 1568 °C, 2854 °F
Boiling point  ? 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
Protactinium has a orthorhombic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (0 °C) 177 nΩ·m
Thermal conductivity 47 W·m−1·K−1
CAS registry number 7440-13-3
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù protactinium
iso NA half-life DM DE (MeV) DP
229Pa syn 1.4 d α 5.58 225Ac
230Pa syn 17.4 d ε 1.310 230Th
β 0.563 230U
231Pa ~100% 32760 y α 5.149 227Ac
232Pa syn 1.31 d β 0.31 232U
233Pa syn 26.967 d β 0.571 233U
234mPa trace 1.17 min β 2.29 234U
IT 0.0694 234Pa
234Pa trace 6.75 h β 0.23 234U
· r

Protaktiníọ̀m tabi Protactinium je apilese kemika to ni ami-idamo Pa ati nomba atomu 91.


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.