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Note on Non-Metals

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Non-metals are the elements in groups 14-16 of the periodic table. Non-metals are the bad conductor of electricity or heat. As opposed to metals, non-metallic elements are very brittle and cannot be rolled into wires or pounded into sheets. Non-metals have low melting and boiling points.

Silicon

Silicon is not found in the pure state. Silicon is the most abundant electropositive element in the earth’s crust. It’s a metalloid with a marked metallic lustre and very brittle. Some important ores of silicon are:

  1. Silica
  2. Feldspar
  3. Kaolinite
  4. Mica
    Source: www.thinglink.com Fig: Silicon
    Source: www.thinglink.com
    Fig: Silicon

Properties

  1. It is grey solid non-metal.
  2. It is found in both crystalline and amorphous formed.
  3. It is a weak electrolyte in crystalline form but strong electrolyte in amorphous form.
  4. It doesn't react with air, water and acid.
Uses
  1. It is used to make glasses.
  2. It is used to make the clay pot.
  3. It is used to make statue and buildings.
  4. Silicon chip is used to make semiconductors.
  5. It is used to make polish and paints.

Sulphur

Sulphur is a chemical element with symbol S and atomic number 16. It is an abundant, multivalent non-metal. Some important ores of sulphur are:

  1. Dolomite
  2. Gypsum
  3. Calcite
  4. Quartz
  5. Pyrite
    Source: www.pbase.com Fig: Sulphur
    Source: www.pbase.com
    Fig: Sulphur
Properties
  1. Sulphur is found in both crystalline and amorphous form.
  2. It is not soluble in water.
  3. It is the bad conductor of heat and electricity.
  4. Sulphur dioxide is formed when sulphur is burnt in the presence of air.
  5. It doesn't react easily with acid.
Uses
  1. Milk of sulphur is used in medicine.
  2. Sulphur is used in the manufacture of matches, gunpowder etc.
  3. It is also used as disinfectant.
  4. It is also used in the vulcanization of rubber.

  • Non-metals are the elements in groups 14-16 of the periodic table. 
  • Non-metals are a bad conductor of electricity or heat.
  • Silicon is not found in a pure state. Silicon is the most abundant electropositive element in The Earth’s crust.
  • Sulphur is a chemical element with symbol S and atomic number 16. 
  • Dolomite and Gypsum are the ores of sulphur.
  • Silica and Feldspar are the ores of silicon.
.

Very Short Questions

The ores of silica are:

  1. Silica
  2. Feldspar
  3. Kaolinite
  4. Mica

The ores of sulphur are:

  1. Dolomite
  2. Gypsum
  3. Calcite
  4. Quartz
  5. Pyrite

The properties of sulphur are:

  1. Sulphur is found in both crystalline and amorphous form.
  2. It is not soluble in water.
  3. It is a bad conductor of heat and electricity.
  4. Sulphur dioxide is formed when sulphur is burnt in the presence of air.
  5. It doesn't react easily with acid.

The properties of silicon are:

  1. It is grey solid non-metal.
  2. It is found in both crystalline and amorphous formed.
  3. It is a weak electrolyte in crystalline form but strong electrolyte in amorphous form.
  4. It doesn't react with air, water and acid.

The uses of sulphur are:

  1. Milk of sulphur is used in medicine.
  2. Sulphur is used in the manufacture of matches, gunpowder etc.
  3. It is also used as disinfectant.
  4. It is also used in vulcanization of rubber.

The uses of silicon are:

  1. It is used to make glasses.
  2. It is used to make the clay pot.
  3. It is used to make statue and buildings.
  4. Silicon chip is used to make semiconductors.
  5. It is used to make polish and paints.

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  • Non-metals are ______ conductor of electricity or heat.

    Good
    Perfect
    Bad
    Partial
  • Which one is not the ore of silicon?

    Silica
    Dolmite
    Mica
    Feldspar
  • Which one is not the ore of sulphur?

    Mica
    Dolmite
    Gypsum
    Quartz
  • Atomic no. of sulphur is ______.

    17
    15
    16
    18
  • Atomic no. of silicon is ______.

    16
    14
    18
    15
  • Which one of the following is the most abundant electro-positive element in the earth s crust?

    Calcium
    Phosphorous
    Silicon
    Iron
  • Silicon is a _____.

    Metalloid
    Metal
    Non-metal
    Semi-metal
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