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John Dalton
Dalton became a secretary of the Manchester Literary and Philosophical Society -
John Dalton's 5 postulates
The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.
All atoms of a given element are identical.
Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.
Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chem -
Dalton's third edition of System of Chemistry
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William Crookes Discovers thallium
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Mendeleev's Law of Octaves was published
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Period: to
Mendeleev organizes the elements according to their atomic properties
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Mendeleev made a formal presentation to the Russian Chemical Society, entitled The Dependence between the Properties of the Atomic Weights of the Elements
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Crookes identifies the first sample of Hellium
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Ernest Rutherford discovers the half-life
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JJ Thomson won the Nobel Prize In Physics for the discovery of the Electron
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Rutherford comes up the the Rutherford model
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First evidence of isotopes appeared
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Niels Bohr introduces the bohr model
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Rutherford was the first to split the atom
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Niels Bohr wins the Nobel Prize for the Fundemental design of the atom
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Chadwick Discovers the neutron
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Chadwick became Professor of Physics at Liverpool