History of Atomic Theory Timeline Quiz

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Questions and Answers

Which scientist modified an earlier theory that matter was made of four elements: earth, fire, water, air?

  • John Dalton
  • J.J. Thomson
  • Democritus
  • Aristotle (correct)

Who was the first to adapt Democritus’ theory into the first modern atomic model?

  • Democritus
  • J.J. Thomson
  • John Dalton (correct)
  • Aristotle

Who was the first person to use the term 'atom' (atomos: meaning indivisible)?

  • J.J. Thomson
  • John Dalton
  • Aristotle
  • Democritus (correct)

Which physicist is credited for discovering the electron?

<p>J.J. Thomson (D)</p> Signup and view all the answers

What did Democritus believe about the fundamental unit of matter?

<p>It was indivisible and called an atom. (A)</p> Signup and view all the answers

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Study Notes

Atomic Theory

  • A scientist modified the earlier theory that matter was made of four elements: earth, fire, water, air.

Democritus' Contribution

  • Democritus was the first to propose that matter is composed of tiny indivisible particles called atoms (atomos: meaning indivisible).
  • Democritus believed that the fundamental unit of matter was the atom, which was eternal, indivisible, and indestructible.

Development of Atomic Model

  • The first modern atomic model was adapted from Democritus' theory.

Discovery of the Electron

  • J.J. Thomson is credited with discovering the electron.

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