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Non-Metals :Physical and Chemical properties

18-FEB-2016 17:14

    Non-Metal are those elements which do not exhibit the metallic characteristics. In the periodic table non-metals are kept almost in the right most. In modern periodic table there are 22 non-metals in which there are 11 gases, 1 liquid and 10 solid.  Bromine occurs in the state of liquid and hydrogen, nitrogen, oxygen, chlorine etc are found in gaseous forms. But carbon, sulphur, phosphorous, iodine etc solid non-metals.

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    Physical properties of non-metal

    The physical properties of non-metal are given below:

    • They do not produce metallic lustre.

    • They are bad conductor of electricity.

    • They are bad conductor of heat.

    • They are electronegative.

    • They cannot be drawn into sheets and wires.

    • They have low specific gravity.

    • They do not reflect light.

    • They do not produce metallic sound.

    • They are found in all states of matter.

    Chemical properties of non-metal

    The chemical properties of non-metal are given below:

    • Non metallic oxides are acidic in nature.

    • They do not dissolve in dilute mineral acids.

    • They form stable compound with hydrogen.

    • Their chlorides are completely hydrolyzed by water.

    Reaction of non-metals with oxygen: They react with oxygen to form acidic oxides or neutral oxides.

    Reaction of non-metals with water: They do not react with water (steam) to evolve hydrogen gas.

    Reaction of non-metal with acids: They do not react with acids because they are negative charged electron.

    Reaction of non-metal with salt solution: They do not react with salt solution but displaces less reactive non-metal from the salt.

    Reaction of non-metal with chlorine: They are react with chlorine to form covalent chlorides which are non- electrolytes.

     

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