4.
Difference between metals and non-metals on the basis of the
physical properties. in 180 to120 words
Answers
metals
1.it has lustre
2.it is a good conductor of heat and electricity
3.it is solid in room temperatur
nonmetals
1.it has no lustre
2. it is bad conductor of heat and electricity
Answer:
Physical properties of metal :
1. State : most of the metals are found solid state at normal temperature except mercury (Hg)Which is found in liquid state at normal temperature.
2. Colour : Mostly metals are grey in colour.
3. Lustre : Most of the metals are lustrous s such as gold , silver , copper , aluminium.
4. Sonorous : Most of the metals when struck with other hard metals or objects produce a special sound, this property is called sonorous.Due to this property of metals they are used to manufacture bell and music instrument etc.
5. Density : generally metals have high density.
6. Melting point : Melting points of metals are generally high except galium and caesium which have low melting points. They melt on the palm of the hand.
Physical state : They are found three states i.e. solid , liquid and gas at normal temperature such as -solid carbon (C) , Sulphur (S) , Iodine (I), liquid -bromine (Br) and gas oxygen (O
2
), nitrogen (N
2
), hydrogen (H
2
)
2. colour: Non-metals have variety of colours such as sulphur (yellow) chlorine gas (greenish yellow), phosphrous (red, white).
3. Lustre : Non-metals are non lustrous .Iodine is an exception, it is a lustrous non-metal.
4.Hardness: They are soft . Diamond is exception , it is the hardest nonmetals found on earth.
5. Sonorous : They do not produce sound.
6. Density : They have less density.
7. Melting point : The have low melting point except diamond and graphite .Diamond and graphite (allotropes of carbon) have very high melting point.
8. heat and electric conductivity : They are bad conductors of heat and electricity except graphite, which is a good conductor of electricity.
Explanation:
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