Write any three differences between metals and non-metals with respect to their physical properties.

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Solution

Metals Non-metals
Metals have lustre. Mercury and gallium are an exception. Non-metals do not have lustre, Iodine and diamond are exceptions.
Metals are solids at room temperature. Mercury is an exception being liquid. Non-metals are either solid or gaseous. Bromine is an exception being in a liquid state.
Metals generally possess the property of hardness. Non-metals do not possess the property of hardness.
They are ductile and malleable. They are non-ductile and malleable.
Metals are good conductors of heat and electricity. Non-metals are bad conductors of heat and electricity except graphite.

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Metals	Non-metals
Metals have lustre. Mercury and gallium are an exception.	Non-metals do not have lustre, Iodine and diamond are exceptions.
Metals are solids at room temperature. Mercury is an exception being liquid.	Non-metals are either solid or gaseous. Bromine is an exception being in a liquid state.
Metals generally possess the property of hardness.	Non-metals do not possess the property of hardness.
They are ductile and malleable.	They are non-ductile and malleable.
Metals are good conductors of heat and electricity.	Non-metals are bad conductors of heat and electricity except graphite.