Protactinyo

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Protactinium
91Pa
Pr

Pa

(Uqt)
thoriumprotactiniumuranium
Appearance
bright, silvery metallic luster
250px
General properties
Name, simbolo, kaiphan protactinium, Pa, 91
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category aktinido
Group, period, block n/a7, f
Standard atomic weight 231.03588
Electron configuration [Rn] 5f2 6d1 7s2
2, 8, 18, 32, 20, 9, 2
Electron shells of protactinium (2, 8, 18, 32, 20, 9, 2)
History
Prediction Dmitri Mendeleev (1869)
Discovery 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
Miscellanea
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
t  h  u
· 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 | edit source]

  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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