Class 9 Chemistry Is Matter Around Us Pure Elements

Elements

  • An element is a substance which cannot be spilt up into two or simpler substances by the means of chemical methods of applying heat, light or electric energy.
    • For Example: - Hydrogen is an element which cannot be split into two or more simpler substances.
  • An element cannot be split into two (or more) simpler substances because it is made up of only one kind of atom.
  • Therefore, Element can also be defined as: - An substance which is made up of only one kind of atoms.
  • For Example: - Copper metal is made up of only one kind of atoms called “copper atoms”.
  • There are 118 elements known till now, out of which 94 elements occur in nature while remaining 24 are prepared artificially.
  • Examples: - Helium, Carbon, Helium etc.
  • Elements can be solids, gases or liquids.
  • In this world all the materials are made up of one or more elements even our human body is made up of combination of certain elements.

Class_9_Is_Matter_Around_Us_Pure_Matter_Gold_Bar

Gold Bar consists of Gold elements

  • Note:- All the elements can be divided into 3 groups:-
  1. Metals
  2. A metal is an element that is malleable, ductile and conducts electricity.
  3. For example: - Iron, copper, Zinc etc.

Class_9_Is_Matter_Around_Us_Pure_Matter_Metals

  1. Non-Metals
  2. A non-metal is an element that is neither malleable nor ductile and does not conduct electricity.
  3. For Example: - Carbon, Sulphur, Phosphorous etc.

 Class_9_Is_Matter_Around_Us_Pure_Matter_Non_Metals

  1. Metalloids
  2. The elements that show some properties of metals and some properties of non-metals are called metalloids.
  3. For Example: - Boron, Silicon etc.

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