11. Non-Metals Have Many Different Colours.
For example, sulphur is yellow, phosphorus is white or red, graphite is black, chlorine is yellowish-green, bromine is red-brown whereas hydrogen and oxygen are colourless.
Though non-metals are small in number as compared to metals, but they play a very important role in our daily life. In fact, life would not have been possible without the presence of non-metals on the earth. For example, carbon is one of the most important non-metals because all the life on this earth is based on carbon compounds. This is because the carbon compounds like proteins, fats, carbohydrates, vitamins and enzymes, etc., are essential for the growth and development of living organisms. Another non-metal oxygen is equally important for the existence of life. This is because the presence of oxygen gas in air is essential for breathing to maintain life. It is also necessary for the combustion (or burning) of fuels which provide us energy for various purposes.
We have just studied the characteristic properties of metals and non-metals. We will now compare the properties of metals and non-metals in tabular form by giving the main points of difference between them.
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Matter in Our Surroundings - Notes
1. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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2. 11. Metals Usually Have a Silver or Grey Colour
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8. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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9. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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10. 1. Separation by a Suitable Solvent
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12. To Study the Properties of a Colloid
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15. To Separate a Mixture of Alcohol and Water
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16. 6. Metals are Usually Strong. They Have High Tensile Strength.
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18. To Study the Properties of a Solution
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19. 3. Metals are Good Conductors of Heat and Electricity.
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23. Separation Of Mixture Of a Solid And a Liquids
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25. Chemical Formula for daily use material
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28. To Study the Properties of a Compound of Iron and Sulphur
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32. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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34. 4. Metals are Lustrous (or Shiny), and can be Polished.
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37. 7. Metals are Solids at the Room Temperature
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42. Separation of Mixture Of Two Solids
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43. To Separate the Salt-Water Mixture (or Salt-Solution)
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50. 11. Non-Metals Have Many Different Colours.
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