There are many elements that are different from metals in physical and chemical properties. called non- metals. For example carbon, oxygen, hydrogen, nitrogen, sulfur, etc. Nonmetals are also called electrically negative elements. Nonmetal make anion.
Properties of Non- Metals
(i.) Generally these are brittle, So its sheets or wires cannot be made.
(ii.) They do not have any special shine, but iodine is a shiny nonmetal.
(iii.) Its melting point are low but the melting point of diamond and graphite it very high, about 3000' C.
(iv.) They are often non-conductors of heat and electricity but graphite is a good conductor of electricity and heat.
(v.) It dose not contain free electron. The outermost orbit of their atom often has 5, 6 or 7 electrons.
(vi.) Non-metal oxides are acidic.
(vii.) Those substance which are made up of the some element, but their structure and composition are different, are called allotropic.
Type of Non- Metals
(i.) Solid Non- Metals-
Carbon, Sulfur, Phosphorus, Iodine etc.
(ii.) Fluid Non- Metals-
Bromine.
(iii.) Gas Non- Metals-
Hydrogen, Oxygen, Chlorine, Ozone etc.
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