non metals ka notes koi dega
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Non-Metals
Nonmetals are those elements which do not exhibit the properties of metals.
Physical Properties of Non-metals
Occur as solids, liquids and gases at room temperature
Brittle
Non-malleable
Non-ductile
Non-sonorous
Bad conductors of heat and electricity
Exceptions in Physical Properties
Alkali metals (Na, K, Li) can be cut using a knife.
Mercury is a liquid metal.
Lead and mercury are poor conductors of heat.
Mercury expands significantly for the slightest change in temperature.
Gallium and caesium have a very low melting point.
Iodine is non-metal but it has lustre.
Graphite conducts electricity.
Diamond conducts heat and has a very high melting point.
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