Element: Oxygen (O)

Element (Atom) NameOxygen
SymbolO
Physical state at room temperatureGas
Element ClassificationNon-metal
Group NameChalcogen
Period Number (Periodic table) 2
Group number (Periodic table)16
Atomic number8
Atomic weight15.9994 (Ref: Jlab-ele008)
16.00 (Ref: Lanl-8)
[15.999 03, 15.999 77] (Ref: ciaaw-oxygen, Nist-8)
Atomic Radius152 pm (Van der Waals) (Ref: Lanl-8)
Density0.001429 g/cm3. (Ref: Jlab-ele008)
Melting point-218.79°C (Ref: Jlab-ele008, Lanl-8)
Boiling point-182.95°C (Ref: Jlab-ele008)
-182.96 °C (Ref: Lanl-8)
Electron shell configuration1s2 
2s2 2p4
Oxidation States-2 (Ref: Jlab-ele008)
2, 1, −1, −2 (Ref: Lanl-8)
Ionization Energy13.618 eV (Ref: Jlab-ele008)
13.618055 eV (Ref: Nist-8)
Number of Stable Isotopes3
InChIInChI=1S/O (Ref: Pubchem-8)
InChI KeyQVGXLLKOCUKJST-UHFFFAOYSA-N (Ref: Pubchem-8)
Remarks 

REFERENCES

  • Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
  • Lanl-8: https://periodic.lanl.gov/8.shtml
  • ciaaw-oxygen: https://www.ciaaw.org/oxygen.htm
  • Nist-8 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=8
  • Pubchem-8: https://pubchem.ncbi.nlm.nih.gov/element/8
  • science.co.il: https://www.science.co.il/elements/

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