Metals and non metals and the economic importance of some metals and non metals
Every day , we can see the matter around us which has a mass and a volume . The matter may exist as an element or a compound , The element is the simplest form of the matter that can not be analyzed into two substances or more .
|There are 112 elements .|
118 elements have been discovered up till now . And they are divided into the natural elements ( they are 92 elements ) and the artificial elements ( they are 26 elements ) .
The elements molecules are formed of the similar atoms that are different from those of the other elements .
The metals are solids except mercury which is liquid . The solid metals as copper , aluminium , lead , gold and silver .
The properties of the metals
You should know that the metals are shiny . And they have metallic luster if they are pure .
They are good conductors of the electricity .
They have high melting and boiling point .
They can be bend , They are malleable , And they can be hammered to form sheets .
They are solids as sulphur , carbon and phosphorous . They are liquids as bromine , And they are gases as oxygen and nitrogen .
The properties of the non-metals
They do not have metallic luster , They are not shiny .
They are not malleable or they can not be hammered . They can not be bend .
They are bad conductors of the electricity except carbon .
They have low melting and boiling points .
Some metals and non metals economic importance
Iron is very important in making the bridges , the car chassis ( the car frames ) , the doors and the sheet lights ( The lamp posts ) , And it is a metal .
Copper is very important in making the electric wires , the statues and the metallic coins , And it is a metal .
Aluminium is very important in the manufacture of the cooking pans , The foil paper and some doorknobs , And it is a metal .
Gold and silver are used in making jewellery , And they are metals .
Carbon ( graphite ) is used in making of the positive electrodes ( The poles ) of the dry batteries ( the cells ) , And it is non metal .
Mercury metal is used in making of the thermometers .