5 Questions
Who was the first person to use the term 'atom' (atomos: meaning indivisible)?
Democritus
Who was the first scientist to adapt Democritus' theory into the first modern atomic model?
John Dalton
Which scientist modified an earlier theory that matter was made of four 'elements' (earth, fire, water, air)?
Aristotle
Which scientist is credited for discovering the electron?
J.J Thomson
According to John Dalton's atomic model, what are all atoms of an element identical in?
Size, mass, and shape
Study Notes
Atomic Theory
- Democritus was the first person to use the term 'atom' (atomos: meaning indivisible).
Development of Atomic Model
- John Dalton adapted Democritus' theory into the first modern atomic model.
Four Elements Theory
- Ancient Greek philosopher Empedocles modified an earlier theory that matter was made of four 'elements' (earth, fire, water, air).
Electron Discovery
- J.J. Thomson is credited for discovering the electron.
Dalton's Atomic Model
- According to John Dalton's atomic model, all atoms of an element are identical in mass, size, and properties.
Test your knowledge of the history of atomic theory with this timeline quiz! Learn about the contributions of influential figures such as Democritus and Aristotle in shaping our understanding of atoms and matter.
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