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Questions and Answers
Which scientist was the first to adapt Democritus’ theory into the first modern atomic model?
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?
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?
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?
Who is credited for discovering the electron using cathode ray tube technology?
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Which scientist modified an earlier theory that matter was made of four “elements”: earth, fire, water, air?
Which scientist modified an earlier theory that matter was made of four “elements”: earth, fire, water, air?
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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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