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Important point on metal and non metal
- element can be classified as metals and non-metals.
- Metals are lustrons, malleable, ductile and are good conductors of heat and electricity .they are solids at room temperature,except mercury which is a liquid.
- Metals can form positive ions by losing electrons to non metals
- Metals combine with oxygen to form basic oxide.Aluminium oxide and zinc oxide show the properties of both basic as well as acidic oxides.these oxides are known as amphotic oxides.
- different metals have different reactivities with water and dilute acids.
- A list of common metals arranged in order of their decreasing reactivity is known as an activity series.
- Metals above hydrogen in the Activity series can displace hydrogen from dilute acids.
- A more reactive metal displces a less reactive metal from its salt solution.
- Metals occur in nature as free elements or in the form of their compounds.
- the extraction of metals from their ores and then refining them for use is known as metallurgy.
- An alloy is a homogeneous mixture of two or more metals , or a metals and a non- metals.
- The surface of some metals,such as iron,is corroded when they are exposed to moist air for a long period of time.this phenomena is known as corrosion.
- Non-metals have properties opposite to that of metals.they are neither malleable nor ductile.they are bad conductors of heat and electricity , except for graphite,which conducts electricity.
