Element: Radium (Ra)

Element (Atom) NameRadium
SymbolRa
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkaline Earth Metal
Period Number (Periodic table) 7
Group number (Periodic table)2
Atomic number88 
Atomic weight226 (Ref: Jlab-ele088, Lanl-88, Nist-88)
Atomic Radius283 pm (Van der Waals) (Ref: Lanl-88)
Density5 g/cm3 (Ref: Jlab-ele088)
Melting point700°C (Ref: Jlab-ele088)
Boiling point1140°C (Ref: Jlab-ele088)
1737 °C (Ref: Lanl-88)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f14 
5s2 5p6 5d10 
6s2 6p6 
7s2
Oxidation States+2 (Ref: Jlab-ele088, Lanl-88)
Ionization Energy5.279 eV (Ref: Jlab-ele088)
5.2784239 eV (Ref: Nist-88)
Number of Stable Isotopes0
InChI1S/Ra
InChI KeyHCWPIIXVSYCSAN-UHFFFAOYSA-N (Ref: Pubchem-88)
RemarksRadioactive (Ref: Pubchem-88)

REFERENCES

  • Jlab-ele088: https://education.jlab.org/itselemental/ele088.html
  • Lanl-88: https://periodic.lanl.gov/88.shtml
  • Ciaaw: https://www.ciaaw.org/atomic-weights.htm
  • Nist-88 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=88
  • Pubchem-88: https://pubchem.ncbi.nlm.nih.gov/element/88
  • science.co.il: https://www.science.co.il/elements/

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