5. Non-Metals are Generally Soft
(except diamond which is extremely hard non-metal). Most of the solid non-metals are quite soft. They can be easily cut with a knife. For example, sulphur and phosphorus are solid non-metals which are quite soft and can be easily cut with a knife. Only one non-metal carbon (in the form of diamond) is very hard. In fact, diamond (which is an allotropic form of carbon) is the hardest natural substance known.
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Matter in Our Surroundings - Notes
1. 7. Metals are Solids at the Room Temperature
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2. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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7. 11. Non-Metals Have Many Different Colours.
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8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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14. 8. Metals Generally Have High Melting Points and Boiling Points.
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18. To Study the Properties of a Suspension
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26. 6. Metals are Usually Strong. They Have High Tensile Strength.
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27. 1. Separation by Fractional Distillation
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30. To Distinguish a Colloid from a Solution
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32. Separation Of Mixture Of Two (Or More) Liquids
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33. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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34. Effect of Temperature and Pressure on Solubility
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35. Separation of Mixture Of Two Solids
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39. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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41. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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42. Separation Of Mixture Of a Solid And a Liquids
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44. Chemical Formula for daily use material
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45. Pure Substances : Elements and Compounds
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47. Comparison Among the Properties of Metals and Non-Metals
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48. To Study the Properties of a Compound of Iron and Sulphur
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49. Solutions, Suspensions And Colloids
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50. To Study the Properties of a Solution
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