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400 BC
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he believe that all matter consisted of extremely small particles that couldn't be divided.
318 BC
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He believed in five elements : earth, air, fire, water, and aether.
1830
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All matter is made of atoms Atoms are indivisible and indestructible
1900
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Max Planck developed the concept of quantum mechanics.
1904
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suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces
1911
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atomic theory in which the atom has a positive nucleus by surrounded negative electrons.
1913
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He completed his theory of atomic structure.
1923
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all atoms and molecule His work led to the atomic cloud model
1923
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He discovered the mass of electron and it was zero
1926
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Werner Heisneberg discovered the Heisenberg Uncertainty Principle
1929
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His ideas were a basis for developing the wave mechanics theory
1932
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He discovered the neutron.