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What is an Atom?. Atom is the building block of matter .. 

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Just like walls are made up of bricks, matter is made up of Atoms.

Development of Atomic Model Theory. Initially, scientists considered atom to be indivisible, but with Research and Development in the field, sub-atomic particles: electron (e-), proton (p+), and neutron (n) were discovered, which made atom divisible.. 

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Initially, scientists considered atom to be indivisible, but with Research and Development in the field, sub-atomic particles: electron (e-), proton (p+), and neutron (n) were discovered, which made atom divisible.

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. RUTHERFORD’S MODEL. O. Gold-foil Experiment. Result. 

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. BOHR’S MODEL In 1913, Neil Bohr postulated: Only certain special orbits of electrons, are allowed inside the atom. While travelling in special orbits the electrons don’t radiate energy.. 

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BOHR’S MODEL In 1913, Neil  Bohr postulated: Only certain special orbits of electrons, are allowed inside the atom. While travelling in special orbits the electrons don’t radiate energy.

. NEUTRONS In 1932, James Chadwick discovered another sub-atomic particle which was named as Neutron, and represented by letter ‘n’.. 

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NEUTRONS In 1932,  James Chadwick  discovered another sub-atomic particle which was named as Neutron, and represented by letter ‘n’.

Structure of an Atom