All things are made up of something called atoms. The atoms cannot be separated no matter what. The atoms can vary in size
Democritus (A greek Philosopher) Theroised Around 490BC
Discovered the electron, leading to his 'plum-pudding' model. He pictured electrons embedded in a sphere of positive electric charge.
J.J. Thomson a British scientist 1897
Suggested that an atom has a central nucleus. Electron move in orbits like the rings around saturn
Hantaro Nagaoka a Japanese Physicist 1904
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