Group 16 Elements
Group 16 of the periodic table contains Oxygen, sulphur, selenium, tellurium and polonium
- Oxygen is the most abundant of all the elements on earth. Oxygen forms about 46.6% by mass of earth’s crust. Dry air contains 20.946% oxygen by volume
- Sulphur in the earth’s crust is only 0.03-0.1%. Sulphur exists primarily as sulphates such as gypsum CaSO4.2H2O, epsom salt MgSO4.7H2O, baryte BaSO4 and sulphides such as galena PbS, zinc blende ZnS, copper pyrites CuFeS2
- Selenium and tellurium are also found as metal selenides and tellurides in sulphide ores.
- Polonium occurs in nature as a decay product of thorium and uranium minerals
- Group16 elements have six electrons in the outermost shell
- Their general electronic configuration is