Element: Helium (He)

Element (Atom) NameHelium
SymbolHe
Physical state at room temperatureGas
Element ClassificationNon-metal
Group NameNoble Gas
Period Number (Periodic table) 1
Group number (Periodic table)18
Atomic number2
Atomic weight4.002602 (Ref: Jlab-ele002, ciaaw-helium, Nist-2)
4.003 (Ref: Lanl-2)
Atomic Radius140 pm (Van der Waals) (Ref: Lanl-2)
Density0.0001785 g/cm3 (Ref: Jlab-ele002)
Melting point-272.2°C (Ref: Jlab-ele002, Lanl-2)
Boiling point-268.93°C (Ref: Jlab-ele002, Lanl-2)
Electron shell configuration1s2
Oxidation States0 (Ref: Jlab-ele002, Lanl-2)
Ionization Energy24.587 eV (Ref: Jlab-ele002)
24.587389011 eV (Ref: Nist-2)
Number of Stable Isotopes2
InChIInChI=1S/He (ref: Pubchem-2)
InChI KeySWQJXJOGLNCZEY-UHFFFAOYSA-N (ref: Pubchem-2)
Remarks 

REFERENCES

  • Jlab-ele002: https://education.jlab.org/itselemental/ele002.html
  • Lanl-2: https://periodic.lanl.gov/2.shtml
  • ciaaw-helium: https://www.ciaaw.org/helium.htm
  • Nist-2 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=2
  • Pubchem-2: https://pubchem.ncbi.nlm.nih.gov/element/2
  • science.co.il: https://www.science.co.il/elements/

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