Template:Infobox protactinium

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[[Category:Template:Pagetype with short description]]

Protactinium, 91Pa
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Protactinium
Pronunciation/ˌprtækˈtɪniəm/ (Template:Respell)
Appearancebright, silvery metallic luster
Standard atomic weight Ar, std(Pa)Template:Val[1]
Protactinium in the periodic table
Template:Periodic table (32 columns, micro) Pr

Pa

(Uqp)
thoriumprotactiniumuranium
Atomic number (Z)91
Groupgroup n/a
Periodperiod 7
Block  f-block
Electron configuration[Rn] 5f2 6d1 7s2
Electrons per shell2, 8, 18, 32, 20, 9, 2
Physical properties
Phase at STPsolid
Melting point1841 K ​(1568 °C, ​2854 °F)
Boiling point4300 K ​(4027 °C, ​7280 °F) (?)
Density (near r.t.)15.37 g/cm3
Heat of fusion12.34 kJ/mol
Heat of vaporization481 kJ/mol
Atomic properties
Oxidation states+2, +3, +4, +5 (a weakly basic oxide)
ElectronegativityPauling scale: 1.5
Ionization energies
  • 1st: 568 kJ/mol
Atomic radiusempirical: 163 pm
Covalent radius200 pm
Color lines in a spectral range
Spectral lines of protactinium
Other properties
Natural occurrencefrom decay
Crystal structurebody-centered tetragonal[2]
Body-centered tetragonal crystal structure for protactinium
Thermal expansion~9.9 µm/(m·K)[3] (at r.t.)
Thermal conductivity47 W/(m·K)
Electrical resistivity177 nΩ·m (at 0 °C)
Magnetic orderingparamagnetic[4]
CAS Number7440-13-3
History
PredictionDmitri Mendeleev (1869)
Discovery and first isolationKasimir Fajans and Oswald Helmuth Göhring (1913)
Named byOtto Hahn and Lise Meitner (1917–8)
Main isotopes of protactinium
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]]
229Pa syn 1.5 d ε 229Th
230Pa syn 17.4 d ε 230Th
231Pa 100% 3.276×104 y α 227Ac
232Pa syn 1.31 d β 232U
233Pa trace 26.967 d β 233U
234Pa trace 6.75 h β 234U
234mPa trace 1.17 min β 234U
Category Category: Protactinium
| references

[[Category:Infobox templates|Template:Remove first word]]

data m.p. cat
in calc from C diff report ref
C 1568
K 1841 1841 0
F 2854 2854 0 Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 1568, K: 1841, F: 2854
comment
data b.p. cat
in calc from C diff report ref
C 4027
K 4300 4300 0
F 7280 7281 -1 delta Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 4027, K: 4300, F: 7280
comment (?)
Th ←

i'box Th

iso
91
Pa (E)
→ U

i'box U

  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
  most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03)
See also {{Infobox element/symbol-to--navbox}}

References

  1. Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  2. Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica. 12 (9): 697. doi:10.1107/S0365110X59002031.
  3. Cverna, Fran, ed. (2002). "Chapter 2. Thermal Expansion". ASM Ready Reference: Thermal Properties of Metals (PDF). ASM International. p. 11. ISBN 0871707683.
  4. Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.

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