Element: Actinium (Ac)

Element (Atom) NameActinium
SymbolAc
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameActinide
Period Number (Periodic table) 7
Group number (Periodic table)None
Atomic number89
Atomic weight227 (Ref: Jlab-ele089, Lanl-89, Nist-89)
Atomic Radius260 pm (Van der Waals) (Ref: Lanl-89)
Density10.07 g/cm3 (Ref: Jlab-ele089)
Melting point1051°C (Ref: Jlab-ele089)
1227 °C (Ref: Lanl-89)
Boiling point3198°C (Ref: Jlab-ele089, Lanl-89)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f14 
5s2 5p6 5d10
6s2 6p6 6d1
7s2
Oxidation States+3 (Ref: Jlab-ele089)
3, 2 (Ref: Lanl-89)
Ionization Energy5.17 eV (Ref: Jlab-ele089)
5.380226 eV (Ref: Nist-89)
Number of Stable Isotopes0
InChIInChI=1S/Ac (Ref: Pubchem-89)
InChI KeyQQINRWTZWGJFDB-UHFFFAOYSA-N (Ref: Pubchem-89)
RemarksRadioactive

REFERENCES

  • Jlab-ele089: https://education.jlab.org/itselemental/ele089.html
  • Lanl-89: https://periodic.lanl.gov/89.shtml
  • ciaaw-atomic-weights: https://www.ciaaw.org/atomic-weights.htm
  • Nist-89: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=89
  • Pubchem-89: https://pubchem.ncbi.nlm.nih.gov/element/89
  • science.co.il: https://www.science.co.il/elements/

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