The different ways scientists have explained the structure of the atom, and how it has changed throughout history.
- In 1804, Dalton proposed that the atom was a plain sphere, solid and whole.
- In 1898, Thomson suggested that the atom comprised a positive sphere with plum-shaped negative electron shells.
- In 1909, Rutherford correctly identified the dense, positive nucleus - and in 1913 Bohr modeled electron rings surrounding this.
- In the 1930s, Chadwick identified that the nucleus of the atom comprised both protons and nuetrons.
5th century BC – Greek philosophers proposed that matter was made up of tiny invisible particles called Atoms or in Greek "A-tomos"
Throughout history scientists have proposed models to help understand the structure of the atom
1804: Dalton's idea of the atom
A plain sphere - solid and whole
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