Element: Thorium (Th)

Element (Atom) NameThorium
SymbolTh
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameActinide
Period Number (Periodic table) 7
Group number (Periodic table)None
Atomic number90
Atomic weight232.0377 (Ref: Jlab-ele090, ciaaw-thorium, Nist-90)
232 (Ref: Lanl-90)
Atomic Radius237 pm (Van der Waals) (Ref: Lanl-90)
Density11.72 g/cm3 (Ref: Jlab-ele090)
Melting point1750°C (Ref: Jlab-ele090, Lanl-90)
Boiling point4788°C (Ref: Jlab-ele090, Lanl-90)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f14 
5s2 5p6 5d10
6s2 6p6 6d2
7s2
Oxidation States+4 (Ref: Jlab-ele090)
4, 3, 2 , 1 (Ref: Lanl-90)
Ionization Energy6.08 eV (Ref: Jlab-ele090)
6.30670 eV (Ref: Nist-90)
Number of Stable Isotopes0
InChIInChI=1S/Th (Ref: Pubchem-90)
InChI KeyZSLUVFAKFWKJRC-UHFFFAOYSA-N (Ref: Pubchem-90)
RemarksRadioactive

REFERENCES

  • Jlab-ele090: https://education.jlab.org/itselemental/ele090.html
  • Lanl-90: https://periodic.lanl.gov/90.shtml
  • ciaaw-thorium: https://www.ciaaw.org/thorium.htm
  • Nist-90: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=90
  • Pubchem-90: https://pubchem.ncbi.nlm.nih.gov/element/90
  • science.co.il: https://www.science.co.il/elements/

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