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Actinium (actinoid)
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Protactinium (actinoid)
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Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (unknown chemical properties)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)
bright, silvery metallic luster
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan protactinium, Pa, 91
Paglitok /ˌprtækˈtɪniəm/
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-tak-Plantilya:Smallcaps all-ee-əm]]
Kategoriyang elemento aktinido
Group, period, block n/a7, f
Gibug-aton sa atomo 231.03588
Kontorno sa elektron [Rn] 5f2 6d1 7s2
2, 8, 18, 32, 20, 9, 2
Electron shells of protactinium (2, 8, 18, 32, 20, 9, 2)
Electron shells of protactinium (2, 8, 18, 32, 20, 9, 2)
Prediction Dmitri Mendeleev (1869)
Pagkadiskobre William Crookes (1900)
First isolation William Crookes (1900)
Named by Otto Hahn and Lise Meitner (1917–8)
Physical properties
Phase magahi
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
Crystal structure tetragonal[1]
Protactinium has a tetragonal crystal structure
Magnetic ordering paramagnetic[2]
Electrical resistivity (0 °C) 177 nΩ·m
Thermal conductivity 47 W·m−1·K−1
CAS registry number 7440-13-3
Most stable isotopes
Main article: Isotopes of protactinium
iso NA half-life DM DE (MeV) DP
229Pa syn 1.5 d ε 0.311 229Th
230Pa syn 17.4 d ε 1.310 230Th
231Pa ~100% 3.276×104 y α 5.150 227Ac
232Pa syn 1.31 d β 1.337 232U
233Pa trace 26.967 d β 0.5701 233U
234mPa trace 1.17 min β 2.29 234U
234Pa trace 6.75 h β 2.195 234U
· r

Ang protactinyo (Iningles protactinium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Pa ug kaiphan nga atomik 91. Ang protactinyo mao ang aktinido.

Ang mga gi basihan niini[usba | usba ang wikitext]

  1. Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica. 12 (9): 697. doi:10.1107/S0365110X59002031.
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

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