Physical Property of Non-Metal - Conductivity
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).
Which of the following non- metals is a good conductor of electricity ? | |||
| Right Option : A | |||
| View Explanation | |||
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 | |||
| View Explanation | |||
Non-metals are not used for making cooking vessels because _________________ | |||
| Right Option : C | |||
| View Explanation | |||
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