Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Metals are generally solid at room temperature but mercury is liquid at room temperature. They are sonorous i.e., produce sound when struck with a hammer. Metals are generally hard but sodium and potassium are exceptions and can be cut with a knife. Non-metals are neither ductile nor malleable so they cannot be made into thin wires or hammered into thin sheets. They are insulators or poor conductors of heat and electricity. At room temperature, they can be in the state of solids, liquids or gases. Metals being hard possess high melting and boiling points whereas non-metals have low melting and boiling points. (a) Which metal is liquid at room temperature? (b) Give any one property of aluminium which is responsible for its use in making cooking utensils. (c) What is meant by ductility?

Dear Student,
(a) Mercury is liquid at room temperature (that is why it is used in thermometers)
(b) Aluminium is corrosion-resistant. In addition to it, it is a good thermal and electrical conductor.
(c) Ductility is the ability of a material (generally metals) to be drawn into wires without breaking or losing tensile strength.
     e.g- gold, copper, aluminium, etc.

Regards

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Mercury is liquid in room temperature

Ductility - the ability of a material to be drawn
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