Questions and Answers
Who is credited with the earliest recorded investigation of atoms?
Democritus
According to John Dalton, how are elements composed?
Of identical atoms that react the same way chemically
What did the Greeks use the term 'atom' to describe?
The smallest unit of matter
What did J.J Thomson conclude while investigating the physical properties of cathode rays?
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How did the Greeks describe the term 'atom'?
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Study Notes
Early Investigations of Atoms
- Democritus is credited with the earliest recorded investigation of atoms.
Atomic Composition
- According to John Dalton, elements are composed of small, indivisible particles called atoms.
Origins of the Term 'Atom'
- The Greeks used the term 'atom' to describe indivisible particles that cannot be further divided.
- The Greeks described the term 'atom' as something that cannot be cut or divided.
Cathode Rays Investigation
- J.J. Thomson concluded that cathode rays consist of tiny, negatively charged particles, now known as electrons.
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