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Theory:

Atom:
The substance is a form of matter which have a constant chemical composition and specific properties.
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Various types of atoms
  
Element:
Element is a pure chemical substance made up of atoms with the same numbers of protons, electrons and neutrons.
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Structure of atom
  • In the world, all substances are made up of certain unique elements.
  • So far, \(118\) elements are identified; in nature, \(92\) elements and others are prepared by laboratories.
  • Element is made up of identical, tiny particles called atoms.
  • The word 'atom' is obtained from the Greek word 'atomos'. Atomos means indivisible (cannot be split or divided).
  • Greek philosophers Democritus and Tamil poet Avvaiyar mentioned atoms in their writings.
  • John Dolton first introduced the atomic theory, followed by J.J.Thomson and Rutherford.