Dalton’s atomic theory:
Above theory states that ultimate particle of matter is atom. Atom can neither be created nor be destroyed. i.e. atom is indivisible.
Discovery of elements:
During the end of 19th century different experiments proved that atom is divisible.
1. J.J Thomson’s discharge tube experiment (1897)
2. Discovery of Proton
3. Origin of positive ray
4. Discovery of neutron (In 1932 British, Sir James Chadwick)
5. Discovery of atomic number: (Mosley’s experiment 1913)
6. Isotopes, Isobars and Isotones
6.1 Isotopes
6.2 Isobars
6.3 Isotones
7. Atomic weight or atomic mass
8. Relative atomic weight
9. Scattering of alpha-particles – Rutherford experiment (1909)
10. Bohr model of atom – Bohr’s theory (1913)
11. Calculation of radius of orbit and energy
12. Explanation of Hydrogen Spectrum
13. Calculation of Rydberg Constant
14. Limitations of Bohr’s theory
15. L.de Broglie Theory
15.1. Application
15.2. Conclusion
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