1.Seleniumis a constituent of more than two dozen proteins that play critical roles in reproduction, thyroid hormone metabolism, and DNA synthesis.

2.Chlorineas chloride ion is an essential component of most bodily fluids.

3.Iodineis essential to life. It is part of the thyroxine molecule, a thyroid gland hormone that controls growth.

4.Boronis required for the maintenance of bone and normal blood levels of estrogen and testosterone.

5.Siliconis necessary for molecules that are involved in bone formation, cartilage composition, and cartilage calcification.

6.Bromineas is the most recent addition to the list of essential nonmetals. The bromide ion is a cofactor that enables an enzyme involved in the formation of collagen.

non metal Like nitrogen is used in fertilizers graphite is used as a good conductor of electricity gold and silver is used for making jewellery cooper is used for making electrical wires,cooking utensils

Non-metalslike nitrogen isusedin fertilizers. Graphite isusedas a good conductor of electricity. Gold and silver areusedfor making jewellery. Copper isusedfor making electrical wires, cooking utensils etc.