Materials Metals and Non-metals Class 8 Notes

Everything around us is categorized into either metals or non-metals. Hence, it is important to know what non-metals and metals are and how to distinguish them. The class 8 science chapter 4 discusses the various physical and chemical properties of metals and non-metals. To help you with it, here we list a few physical and chemical properties of metals and non-metals.

  1. Physical Properties of Metals
    • Metals are lustrous
    • Metals are ductile and malleable
    • Metals are good conductors of heat and electricity
    • Metals, when struck by hard objects, make a sound
  1. Chemical Properties of Metals
    • Metals on reacting with oxygen produce metal oxide which is basic in nature
    • A few metals react with water and produce metal hydroxide and hydrogen gas
    • Hydrogen gas and metal salts are produced when metals react with acids
    • Some metals react with bases and produce hydrogen gas
    • Less reactive metals are displaced by more reactive metals from their compound in aqueous solutions
  1. Physical Properties of Non-metals
    • Non-metals are non-lustrous
    • Non-metals are not ductile and malleable
    • Non-metals are poor conductors of heat and electricity
    • Non-metals do not produce sound when struck by hard objects
  1. Chemical Properties of Non-metals
    • When non-metals react with oxygen, non-metal oxides which are acidic in nature are produced
    • Non-metals do not react with water and acids

Metals are used in building machinery, automobiles industrial gadgets, cooking utensils and many more. Non-metals are used in chemical fertilisers, water purification, antiseptic and crackers.

Metals And Nonmetals Class 8 MCQ

  1. Which of the following can be beaten into thin sheets?
    • Phosphorous
    • Zinc
    • Oxygen
    • Sulphur

Answer: Zinc

  1. Metal oxides are _____ in nature.
    • acidic
    • basic
    • neutral
    • None of the above

Answer: basic

Learn more about metals and non-metals and other related topics including NCERT class 8 science notes, at BYJU’S.

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