Class 8 Chemistry Metals and Non metals Introduction

Introduction

In our day to day life we use many well-known materials like iron, aluminum, copper, gold, silver and many more. We are also familiar with the elements like oxygen, carbon, Sulphur as well. These are all obtained from some naturally occurring substances encompassing one or more elements or their compounds. They are termed as minerals. Minerals form which elements can be profitably extracted are termed as ores.

   

Fig. Ores and Minerals

 

  • There 92 well known naturally occurring minerals of which 70 are metals and rets 20 are the non-metals.
  • Some metals possess the characteristics of both metals as well as non-metals. They are termed as metalloids. For instance, boron, silicon, germanium, arsenic, antimony, tellurium, and polonium.
  • Elements found in free state includes some metals like gold, silver, platinum etc. and some non-metals like helium, neon, argon etc. as well.
  • A major proportion of metals are found in combined states like oxides, sulphides, carbonates, silicates etc. Some non-metals like sulphur, phosphorous too are found to exist in combined state.

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