Question

give two uses of each oxygen Mercury nitrogen copper iodide iron Phosphorus chlorine

Answer 1

1)Uses of oxygen for breathing, photosynthesis.                                                 2)Mercury: batteries, thermometers.
3)Nitrogen: making of fertilisers, dyes
4) Copper: electrical props as wiring, coin making 
5) Iodide: To neutralizes radiation, to make polarising filters for LCD displays
6) Iron: uses in agriculture, pipes, automobiles
7) Phosphorus: flares and burners
8) Chlorine: used in drinking water, for medicine as antiseptics