PHYSICAL PROPERTIES OF METALS
- Metals are generally hard.
- The hardness varies from metal to metal.
- Metals, in their pure state, have a shining surface.
- This property is called metallic luster.
- Some metals can be beaten into thin sheets.
- This property is called malleability.
- Gold and silver are the most malleable metals.
- The ability of metals to be drawn into thin wires is called ductility.
- Gold is the most ductile metal.
- A wire of about 2 km length can be drawn from one gram of gold.
- It is because of their malleability and ductility that metals can be given different shapes according to our needs.
- metals are good conductors of heat and have high melting points.
- The best conductors of heat are silver and copper.
- Lead and mercury are comparatively poor conductors of heat.
Note- the wires that carry current in your homes have a coating of polyvinyl chloride (PVC) or a rubber-like material.
- metals have high melting points but gallium and cesium have very low melting points. These two metals will melt if you keep them on your palm.
- All metals except mercury exist as solids at room temperature.
- The metals that produce a sound on striking a hard surface are said to be sonorous.