5. Metals are Generally Hard
(except sodium and potassium which are soft metals). Most of the metals are hard. But all the metals are not equally hard. The hardness varies from metal to metal. Most of the metals like iron, copper, aluminium, etc., are very hard. They cannot be cut with a knife. There are some exceptions. Sodium and potassium are soft metals which can be easily cut with a knife.
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Matter in Our Surroundings - Notes
2. 7. Metals are Solids at the Room Temperature
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5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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8. 11. Non-Metals Have Many Different Colours.
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9. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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15. 8. Metals Generally Have High Melting Points and Boiling Points.
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19. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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23. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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24. To Study the Properties of a Suspension
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25. Effect of Temperature and Pressure on Solubility
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26. Chemical Formula for daily use material
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27. Pure Substances : Elements and Compounds
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31. 1. Separation by a Suitable Solvent
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33. Solutions, Suspensions And Colloids
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35. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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41. 3. Metals are Good Conductors of Heat and Electricity.
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46. Comparison Among the Properties of Metals and Non-Metals
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50. Separation Of Mixture Of a Solid And a Liquids
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