Physical Property of Non-Metal - Conductivity


 
 
Concept Explanation
 

Physical Property of Non-Metal - Conductivity

Non- metals are generally poor conductors of heat as they lack free electrons. Diamond, which is good conductor of heat, is an exception.

Electrical conductivity of Non- metals: Non- metals are generally poor conductors of electricity because they do not have the free electrons which helps in the conduction of electricity . Graphite, which is a good conductor of electricity, is an exception. Nonmetals have 4,5,6,7,8 electrons in their outermost shell. These electrons are not free and hence they do not conduct electricity.

Non-Metals are Poor Conductors of Heat and Electricity. This means that non- metals do not allow heat and electricity to pass through them. For example, sulphur is a non-metal which does not conduct heat or electricity. Similarly, a piece of coal (which is mainly carbon non-metal) also does not conduct heat or electricity. Many of the non-metals are, in fact, very good insulators. There are, however, some exceptions. A form of the carbon element, diamond is a non-metal which is a good conductor of heat. And another form of carbon element, graphite is a non- metal which is a good conductor of electricity. Being a good conductor of electricity, graphite is used for making electrodes (as that in dry cells).

Sample Questions
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Question : 1

Which of the folowing allotropic from a carbon good conductor of electricity ?

Right Option : C
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Question : 2

_______________________, is good conductor of heat, is an exception.

Right Option : C
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Question : 3

Which of the following are correct :

(a) Non- metals are generally poor conductors of heat as they lack free electrons.

(b) Graphite, which is a good conductor of electricity, is an exception.

(c) Diamond, which is bad conductor of heat, is an exception.

Right Option : A
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