Protaktiníọ̀m

Protactinium
91Pa
Pr ↑ Pa ↓ (Uqu) Tábìlì ìdásìkò thorium ← protactinium → uranium
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/a, 7, 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
Magnetic ordering	paramagnetic
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

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