by Rajan Gupta | Aug 29, 2020 | Non metals
The number of electrons accepted by a non metal is called valency of the non metal. For example, one atom of chlorine accepts 1 electron to form a negative chloride ion (Cl–), so chlorine is a non-metal. Here because an atom of chlorine gains 1 electron so the valency...
by Rajan Gupta | Aug 29, 2020 | Non metals
There are more than 115 elements known at present and these can be divided into two main groups: Metals Metals are the elements which can form positive ions by losing electrons. For example, Na is a metal because it can form positive ion (Na+) ion by losing an...
by Rajan Gupta | Aug 28, 2020 | Metals
Take three test tubes A, B and C and place one clean iron nail in each of them. In the test tube A pour some water and close its mouth with the help of a cork. In the test tube B pour boiled water which does not contain dissolved air. Also pour some oil in test tube B...
by Rajan Gupta | Aug 28, 2020 | Metals
Air is a mixture of various types of gases and water vapours. The gases and water present in air react gradually with the surfaces of metals and form their oxides, sulphides, carbonates or sulphates. The formation of these compounds eats up metals slowly. This...
by Rajan Gupta | Aug 28, 2020 | Metals
An alloy is a homogeneous mixture of one metal with one or more other metals or non-metals. An alloy is prepared by mixing metals in the molten state in a fixed proportion by weight. Various properties of metals like malleability, ductility, strength, hardness,...
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