Online notes for 9th class science - Is Matter Around Us Pure

In ths article, we have discussed the 'Non Metals'.

Non Metals : A non-metal is an element that is neither malleable /ductile and they are not good conductors of electricity. Eg: – Krypton, xenon, diamond, graphite etc. They are the allotropic forms of carbon. All the nonmetals are solids or gases, except bromine which is a liquid non-metal at room temperature.

Non Metals are not lustrous- Nonmetals do not have a shiny They have a dull appearance. Iodine is a nonmetal having a lustrous appearance. It has a shiny surface as metals have.
Non –Metals are generally soft– Most of the nonmetals are soft they can easily be cut with a knife. Carbon is the only nonmetal which is hard. Diamond is the exception which is extremely hard natural substance.
Non Metals are not strong- Nonmetals cannot hold large weights. They have very low tensile strength.
Non metals are not malleable, they are brittle- Non metals cannot be beaten into thin sheets with a hammer. They break into small pieces when hammered. Sulphur and phosphorus are brittle. They break into pieces when the hammer is a strike on them.
Non metals are not ductile- It means that nonmetals cannot be drawn into wires. They are easily snapped on stretching. On stretching, the nonmetal breaks into pieces.
Nonmetals are bad conductors of heat and electricity- It means the nonmetals do not allow heat and electricity to pass through them. Diamond and graphite are the forms of nonmetal which are good conductors of electricity. This is a reason why graphite is used for making electrodes.

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