write theory of Rutherford , j j Thomson and Bohr's
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three of them helped to fond the structure of an atom
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RUTHERFORD SCATTERING ATOMIC MODEL
- Discovery of nucleus by Rutherford.
- Maximum alpha particles passes through the gold foil without any deflection that means maximum part of atom is empty.
- Some alpha particles are deflected from their path that means the total positive charge of atom is centralised and this point is called nucleus.
- Very few alpha particles (1 out of 20,000) come out with 180° , that means size of nucleus is very small as compared to atom.
J.J. THOMSON ATOMIC MODEL
- According to this model atom is a solid sphere in which total positive charge is equally distributed and total negative charge present as seeds in water melon.
BOHR ATOMIC MODEL
- This theory is applicable on single electron species.
- Atom has nucleus where all protons and neutrons are present.
- Electron revolve around the nucleus in circular path , at this time the attraction force of nucleus will be equals to centrifugal force of electron.
- Example - H, He+ etc.
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