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A group of materials 'P' can be sub-divi...

A group of materials 'P' can be sub-divided into three groups 'Q', 'R' and 'S' as the basis of their characteristics The substance belonging to group 'Q' may be solid, liquids and gases. These are poor conduction of electricity. The substances included in group 'R' are solids which are good conductors of electricity. Group 'S' consists of substances which have the characteristics common to the substances belonging to groups 'Q' and 'R'.
Based upon the above observations, answer the following questions :
(a) To which class of substances materials present in group 'P' belong ?
(b) Name the type of substances 'Q'. Give two examples.
(c ) Name the type of substances 'R'. Give two examples.
(d) Name the type of substances 'S'. Give two examples.

Text Solution

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(a) Materials present in group 'P' are known as elements.
(b) The substances 'Q' which are poor conductors of electricity and exist in all the three states of matter, are non-metals.
(c ) The substances 'R' are metals since they are good conductors of electricity.
(d) The substances 'S' are metalloids or semi-metals since they have characteristics common to both 'P' and 'Q'.
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