Oxygen Element in Periodic Table | Atomic Number Atomic Mass


Oxygen Element:

The chemical element oxygen is a highly reactive non-metal. Its atomic number is 8 and indicated by the symbol O. In the periodic table of elements, oxygen is a p-block element and it belongs to group 16 and period 2. After hydrogen and helium it is the third most abundant element in the universe. It is also most abundant element in the Earth’s crust. More than half of all the atoms in the Earth’s crust are oxygen atoms. It is capable of combing with all elements except inert gases. Naturally occurring O contains 3 stable isotopes, 16O, 17O and 18O. 14 radioisotopes have been characterized. Around 2 billion years ago, oxygen first appeared in the Earth’s atmosphere, accumulating from the photosynthesis of Cyanobacteria.

Uses Of Oxygen Element:

  • The greatest commercial use of O  is in steel production.
  • O is also used in oxyacetylene welding and cutting of metal.
  • It is also used in the production of ethylene oxide, which is used as antifreeze and to make polyester, and chloroethene, the precursor to PVC.
  • Living things depend on oxygen for respiration.
  • Patients who have respiratory ailments are given extra doses of oxygen.


Oxygen Element Information:

Discovery year: 1771

Discovered by:  Carl Wilhelm Scheele

Atomic number: 8

Relative atomic mass: 15.999 

Electron configuration: [He] 2s2 2p4

Block: p-block

Other elements in the same block:

Boron, Carbon, Nitrogen, Fluorine, Neon, Aluminium, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Gallium, Germanium, Arsenic, Selenium, Bromine, Krypton, Indium, Tin, Antimony, Tellurium, Iodine, Xenon, Thallium, Lead, Bismuth, Polonium, Astatine, Radon, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson are the same block elements.

Period: period 2

Other elements in the same period:

Lithium, Beryllium, Boron, Carbon, Nitrogen, Fluorine and  Neon elements are in the same period

Group: group 16 (chalcogens)

Other elements in the same group:

Sulfur, Selenium, Tellurium, Polonium and Livermorium are the same group elements.

Other elements in the same orbital:

Boron, Carbon, Nitrogen, Fluorine, Neon are the elements in the same orbital

Allotropes: O2, O3 (Ozone)

Key isotopes: 16

Melting point: −218.79°C, −361.82°F, 54.36 K

Boiling point: −182.962°C, −297.332°F, 90.188 K

Element category: diatomic non-metal

Density (g cm−3):0.001308

CAS number: 7782-44-7

Color: colorless

You can know detailed information for each element,

Hydrogen, HeliumLithiumBerylliumBoronCarbonNitrogenOxygenFluorine,  Neon , SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon, PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromine, Krypton,  Rubidium, StrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodine, Xenon,  Caesium, BariumLanthanum,  CeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercuryThalliumLeadBismuthPoloniumAstatine, Radon,  Francium, RadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessine, Oganesson.

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