Oxygen gas was discovered by Swedish pharmacist, Karl Scheele in 1771. Oxygen is prepared in fundamental chemistry using the same process Scheele, Priestley and Lavoisier (who named the element) employed. Comprising 87 percent of the oceans, one fifth of the atmosphere and six out of ten atoms on the crust, oxygen is the most abundant element on the surface of the earth. Oxygen is a Chalcogen.
Atomic number-8
Density-1.43 g/mL
Atomic weight-15.999 amu
Melting point--222.65 C
Boiling point--188.82 C
Atomic radius-0.66 Covalent, 1.40 Van Der Waals
Ionization Potential-314 kcal/mols of atoms
Electronegativity-3.5
Electron configuration:[He]2s2 2p4
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