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Questions and Answers
Who was the first person to use the term 'atom' and believed that matter is made of indivisible particles?
Who was the first person to use the term 'atom' and believed that matter is made of indivisible particles?
- John Dalton
- J.J. Thomson
- Democritus (correct)
- Aristotle
Which scientist introduced the idea that all substances are made of atoms that cannot be divided or destroyed?
Which scientist introduced the idea that all substances are made of atoms that cannot be divided or destroyed?
- Aristotle
- John Dalton (correct)
- Democritus
- J.J. Thomson
According to John Dalton's atomic model, what are the atoms of an element like?
According to John Dalton's atomic model, what are the atoms of an element like?
- Different in size, mass, shape, and other physical properties
- Completely different from each other
- Identical in size, mass, shape, and other physical properties (correct)
- Identical only in size and mass
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 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?
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Study Notes
Ancient Roots of Atomic Theory
- Democritus was the first person to use the term 'atom' and believed that matter is made of indivisible particles.
Early Atomic Models
- John Dalton introduced the idea that all substances are made of atoms that cannot be divided or destroyed.
- According to Dalton's atomic model, atoms of an element are identical, indivisible, and indestructible.
Discovery of Subatomic Particles
- J.J. Thomson is credited for discovering the electron using cathode ray tube technology.
Development of Modern Atomic Models
- John Dalton was the first to adapt Democritus' theory into the first modern atomic model.
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