Element: Protactinium (Pa)

Element (Atom) NameProtactinium
SymbolPa
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameActinide
Period Number (Periodic table) 7
Group number (Periodic table)None
Atomic number91
Atomic weight231.03588 (Ref: Jlab-ele091, ciaaw-protactinium, Nist-91)
231 (Ref: Lanl-91)
Atomic Radius243 pm (Van der Waals) (Ref: Lanl-91)
Density15.37 g/cm3 (Ref: Jlab-ele091)
Melting point1572°C (Ref: Jlab-ele091)
1568 °C (Ref: Lanl-91)
Boiling point4027 °C (Ref: Lanl-91)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f14 
5s2 5p6 5d10 5f2
6s2 6p6 6d1
7s2
Oxidation States+5, +4 (Ref: Jlab-ele091)
2, 3, 4, 5 (Ref: Lanl-91)
Ionization Energy5.89 eV (Ref: Jlab-ele091)
[5.89] eV (Ref: Nist-91)
Number of Stable Isotopes0
InChIInChI=1S/Pa (Ref: Pubchem-91)
InChI KeyXLROVYAPLOFLNU-UHFFFAOYSA-N (Ref: Pubchem-91)
RemarksRadioactive

REFERENCES

  • Jlab-ele091: https://education.jlab.org/itselemental/ele091.html
  • Lanl-91: https://periodic.lanl.gov/91.shtml
  • ciaaw-protactinium: https://www.ciaaw.org/protactinium.htm
  • Nist-91: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=91
  • Pubchem-91: https://pubchem.ncbi.nlm.nih.gov/element/91
  • science.co.il: https://www.science.co.il/elements/

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