CHAPTER  3

METALS AND NON- METALS

 Physical properties of metals and non- metals.

 1     LUSTRE  -

  Metals have shining surface.

    Non-metals do not have shinig surface

 * Except iodine   

 2 Hardness -

    Metals are generally hard.

  • Except sodium lithium and potassium which are soft and can be cut with knife.

 Non – metals are generally soft.

  • Except diamond a form of carbon which is the hardest natural substan

3 Malleability - 

 Metals can be beaten into thin sheets gold and silver are the most malleable metals.

Non- metals are non-mallerable.

4 Ductility -

 Metals can be drawn into thin wires.

 Non- metals can not be drawn into thin wires. They are non- ductile.

5 Conductor of heat and electricity -

Metals are good conductor of heat and electricity of heat. Lead and mercury are poor conductor of heat.

Metals are good conductor of heat and electricity.

Non- metals are poor conductor of heat EXCEPT graphite.

6 state -

 The metals exist as solids. EXCEPT mercury

The non- metals exist as solids or gaseous.EXEPT  bromine.

7 density -

Metals have high density and high melting point.

Except sodium and potassium.

8 Oxides -

 Metallic oxides are basic in nature.

Non metallic oxides are acidic in nature.

9 Sonorous -

Metals produce a sound on strinking a hard surface.

Non-metals are not sonorous.