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Thomson model:

According to the model, an atom may be regarded as a sphere of uniformly distributed positive charge where there are spread symmetrically.

The positive charges must hold the electrons by electrostatic forces.

The force of attraction to the center of the sphere balances the reciprocal repulsions involving the electrons.

Within an atom using one electron such as the hydrogen atom, the electron has to be situated in the center of the sphere that was positive.

At the corners, the electrons needs to be in the three-electron system.Carrying on in this way,

Thomson could describe the placement of electrons which range from 1 to 100 inside the sphere that is positive.This model was likewise called 'the plum pudding model'.

With this particular model he attempted to spell out the observed spectra of elements.He could describe radioactivity etc., like chemical reactions with some success the procedure

The model is appropriate for just one electron process.In accordance with Rutherford as the electron revolves round the nucleus energy is liberated by it often so when the electron loses all its energy it will fall in the nucleus that was not possible.

The objection was raised by Clerk Maxwell related to constant emission of energy by electron does not be given by the model.

The Rutherford's model of atom doesn't say anything regarding the placement of electrons in a atom.Isotope:Isotopes are defined as atoms.

These atoms comprise an identical amount of electrons and protons, however a different amount of neutrons.

For example, in nature, hydrogen is found in three forms with different mass numbers, namely protium (), deuterium(), and tritium (). These are the three naturally occurring isotopes of hydrogen. The atomic number of each isotope is 1, but the mass number varies i.e. it is 1, 2, and 3 respectively
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