O Element

Oxygen is element No. 8 on the Periodic Table of Elements. (Image credit: Andrei Marincas Shutterstock) Breathe in breathe out. Hooray for oxygen, the element that keeps much of life on. Oxygen atoms have 8 electrons and the shell structure is 2.6. The ground state electron configuration of ground state gaseous neutral oxygen is He. 2p4 and the term symbol is 3P2. Schematic electronic configuration of oxygen. The Kossel shell structure of oxygen. Element Oxygen (O), Group 16, Atomic Number 8, p-block, Mass 15.999. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Before running Mac OSX 11 (Big Sur), please read our knowledge base article for information regarding compatibility. The O'NEAL Element line is made with a roomy, comfortable fit that is sure to please everyone in the family. It's durable, wear-resistant panels, tagless design, and cuffless pant ensure the O'NEAL Element is streamlined and ready for riding. Featuring a more extensive array of sizes and colors than most gear lines, the O'NEAL Element truly has something for everybody. Fit: Relaxed fit for.

Element Oxygen - O

O Element Periodic Table

Comprehensive data on the chemical element Oxygen is provided on this page; including scores of properties, element names in many languages, most known nuclides of Oxygen. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

Oxygen Menu

O element atomic mass
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O element mass

Overview of Oxygen

  • Atomic Number: 8
  • Group: 16
  • Period: 2
  • Series: Nonmetals
O Element

Oxygen's Name in Other Languages

  • Latin: Oxygenium
  • Czech: Kyslík
  • Croatian: Kisik
  • French: oxygène
  • German: Sauerstoff - r
  • Italian: Ossigeno
  • Norwegian: Oksygen
  • Portuguese: Oxigênio
  • Russian: Кислород
  • Spanish: Oxígeno
  • Swedish: Syre
O Element

Atomic Structure of Oxygen

O element group

How Many Elements Are There

  • Atomic Radius: 0.65Å
  • Atomic Volume: 14cm3/mol
  • Covalent Radius: 0.73Å
  • Cross Section (Thermal Neutron Capture) σa/barns: 0.00019
  • Crystal Structure: Cubic
  • Electron Configuration:
    1s2 2s2p4
  • Electrons per Energy Level: 2,6
    Shell Model
  • Ionic Radius: 1.4Å
  • Filling Orbital: 2p4
  • Number of Electrons (with no charge): 8
  • Number of Neutrons (most common/stable nuclide): 8
  • Number of Protons: 8
  • Oxidation States:-2,-1
  • Valence Electrons: 2s2p4
    Electron Dot Model

Chemical Properties of Oxygen

  • Electrochemical Equivalent: 0.29847g/amp-hr
  • Electron Work Function:
  • Electronegativity: 3.44 (Pauling); 3.5 (Allrod Rochow)
  • Heat of Fusion: 0.22259kJ/mol
  • Incompatibilities:
    oxidizable materials
  • Ionization Potential
    • First: 13.618
    • Second: 35.117
    • Third: 54.934
  • Valence Electron Potential (-eV): -20.6

Physical Properties of Oxygen

  • Atomic Mass Average: 15.9994
  • Boiling Point: 90.33K -182.82°C -297.08°F
  • Coefficient of lineal thermal expansion/K-1: N/A
  • Conductivity
    Thermal: 0.0002674 W/cmK
  • Density: 1.429g/L @ 273K & 1atm
  • Description:
    Colorless, odorless, tasteless gas
  • Enthalpy of Atomization: 249.4 kJ/mole @ 25°C
  • Enthalpy of Fusion: 0.22 kJ/mole
  • Enthalpy of Vaporization: 3.41 kJ/mole
  • Flammablity Class: Non-flammable gas (Oxidizer)
  • Freezing Point:see melting point
  • Heat of Vaporization: 3.4099kJ/mol
  • Melting Point: 50.5K -222.65°C -368.77°F
  • Molar Volume: 14 cm3/mole
  • Optical Refractive Index: 1.000271 (gas) 1.221 (liquid)
  • Physical State (at 20°C & 1atm): Gas
  • Specific Heat: 0.92J/gK

O Element Protons Neutrons Electrons

Regulatory / Health

O Element Periodic Table

  • CAS Number
    • 7782-44-7
  • NFPA 704
    • Health:
    • Fire:
    • Reactivity:
    • Special Hazard: OxidizerOSHAPermissible Exposure Limit (PEL)
      • No limits set by OSHA
    • OSHA PEL Vacated 1989
      • No limits set by OSHA
    • NIOSHRecommended Exposure Limit (REL)
      • No limits set by NIOSH
    • Levels In Humans:
      Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
      • Blood/mg dm-3: constituent of water
      • Bone/p.p.m: 285000
      • Liver/p.p.m: 160000
      • Muscle/p.p.m: 160000
      • Daily Dietary Intake: mainly water
      • Total Mass In Avg. 70kg human: 43 kg (mainly water)

    Who / Where / When / How

    • Discoverer: Joseph Priestley, Carl Wilhelm Scheele
    • Discovery Location: Leeds England (Priestley)/Uppsala Sweden (Scheele)
    • Discovery Year: 1774
    • Name Origin:
      Greek: oxus (acid) and gennan (generate).
    • Abundance of Oxygen:
      • Earth's Crust/p.p.m.: 474000
      • Seawater/p.p.m.: N/A
      • Atmosphere/p.p.m.: 209500
      • Sun (Relative to H=1E12): N/A
    • Sources of Oxygen:
      Obtained primarily from by liquification and then fractional distillation of the air. Annual world wide production is around 100,000,000 tons.
    • Uses of Oxygen:
      Forms almost 21% of atmosphere. Used in steel making, welding, water purification, cement. It is also required for supporting life and combustion.
    • Additional Notes:
      Oxygen is the most abundant element on the surface of the earth.

    Oxygen Menu

    • Oxygen Page One
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    A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

    Related Resources

    • Anatomy of the Atom
      Answers many questions regarding the structure of atoms.
    • Molarity, Molality and Normality
      Introduces stoichiometry and explains the differences between molarity, molality and normality.
    • Molar Mass Calculations and Javascript Calculator
      Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
    • Chemical Database
      This database focuses on the most common chemical compounds used in the home and industry.

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