History of Atomic Theory Timeline Quiz

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Questions and Answers

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

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

Who was the first person to use the term atom?

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

According to John Dalton's atomic model, what are atoms of an element identical in?

  • Physical properties only
  • Shape and weight only
  • Size and mass only
  • Size, mass, shape, and other physical properties (correct)

Who is credited for discovering the electron using cathode ray tube technology?

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

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

<p>Aristotle (C)</p> Signup and view all the answers

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Study Notes

Atomic Theory Development

  • Democritus' theory of atomism was adapted into the first modern atomic model by John Dalton.

The Term "Atom"

  • The term "atom" was first used by Democritus.

Dalton's Atomic Model

  • According to John Dalton's atomic model, atoms of an element are identical in mass, size, and chemical properties.

Electron Discovery

  • J.J. Thomson is credited with discovering the electron using cathode ray tube technology.

Early Theory Modification

  • Empedocles modified the earlier theory that matter was made of four “elements”: earth, fire, water, air.

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