PERIODIC ELEMENT
O (Oxygen)

 



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Atomic number : 8
Atomic mass : 15.999 g.mol-1
Electronegativity according to Pauling : 3.5
Density : 1.429 kg/m3 at 20 °C
Melting point : -219 °C
Boiling point : -183 °C
Vanderwaals radius : 0.074 nm
Ionic radius : 0.14 nm (-2)
Isotopes : 4
Electronic shell : [He] 2s22p4
Energy of first ionisation : 1314 kJ.mol-1
Energy of second ionisation : 3388 kJ.mol-1
Energy of third ionisation : 5300 kJ.mol-1
Discovered by : Joseph Priestly in 1774
 
Atomic Structure Uses (supports life, burning)