Question 1 Why non-metals are not malleable?
Question 2 Why non-metals are not ductile?
Question 3 Name one non-metal which is a good conductor of electricity?
Question 4 Why graphite is used in making electrodes?
Question 5 Write few properties of non-metals?
Question 6 Name one lustrous non-metal?
Question 7 What is brittleness?
Properties of non-metals
1)Non-Metals are not malleable:Non-metals can not be beaten into thin sheets with a hammer.They break into small pieces when hammered.
Carbon is a non-metal.It is found in many forms such as charcoal,coke,graphite and diamond.The pencil of lead is a form of carbon called graphite.Carbon is brittle.
Sulphur is also a non-metal.If we hammer a piece of sulphur,it will break into small pieces.Sulphur is brittle.
We cannot obtain thin sheets by beating non-metals.
The property due to which non-metals break on hammering is called brittleness.
2)Non-Metals are not Ductile:The non-metals can not be drawn into thin wires.They easily break on stretching.
For Ex:Sulphur and phosphorus are non-metals and they are not ductile.When stretched they break into pieces and do not form wires.
3)Conductivity:They do not allow heat and electricity to pass through them.
For Ex:Sulphur,coal,phosphorus etc are non-metals and do not conduct electricity and heat.
Diamond is a non-metal which is a good conductor of heat.
Graphite is a good conductor of electricity.Therefore it is used in making electrodes.
4)Lustre:They are not shiny,they are dull in appearance.
For Ex:Sulphur,phosphorus are solid non-metal which do not have lustre or shine.
Iodine is a non-metal having lustre.
5)Strength:They cannot hold large weight.They have low tensile strength and breaks easily.
6)Sonorousness:They do not make a ringing sound when we strike them.
If we drop a piece of carbon or a lump of sulphur on the floor or strike them with hammer,we do not hear any ringing sound.
7)Hardness:Most of the non-metals can be cut into pieces with a knife.