5. Elements are broadly classified into metals & non-metals. State six general differences physical properties of metals & non-metals. State two metals & two non-metals contradict with the general physical properties - giving reasons. State one difference property between metalloids & noble gases. 6. With reference to elements - define the term 'molecule'. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
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Properties of Metals:
- They are lustrous, i.e. they shine.
- They are malleable, i.e. they can be drawn into sheets.
- They are ductile, i.e. they can be made into wires.
- They are good conductors of heat and electricity.
- They have high density.
- They have high melting and boiling points.
Properties of Non-Metals:
- They are non-lustrous, i.e. they do not shine.
- They are non-malleable, i.e. they cannot be drawn into sheets.
- They are non-ductile, i.e. they cannot be made into wires.
- They are bad conductors of heat and electricity.
- They have low density.
- They have low melting and boiling points.
Metals which contradict general properties of metals:
- Zinc is a metal but it is not malleable and not ductile.
- Mercury is a metal but it is liquid even at room temperature while other metals are generally solid.
Non-metals which contradict general properties of non-metals:
- Iodine is lustrous while non-metals are not lustrous.
- Graphite is a good conductor of electricity, while non-metals are bad conductors of electricity.
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