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The Atom ((J. J. Thomson (His research in cathode rays led to the…
The Atom
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Ernest Rutherford
In 1911, he was the first to discover that atoms have a small charged nucleus surrounded by largely empty space,
Democritus
Everything is composed of “atoms”, which are physically, but not geometrically, indivisible.
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Isotopes
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
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