Origins of atomic theory
Ancient Greek and Indian ideas evolved into Dalton’s scientific model.
Parmanus Origin
Ancient Indian indivisible particles
Thomson’s plum pudding model
Atom is a positive sphere with embedded electrons.
Atomos Origin
Indivisible particles by Greek thinkers
Dalton’s Atomic Theory
Atoms are indivisible fundamental units
Thomson’s Model
Atom as positive sphere with embedded electrons
Cathode Rays
Beams of negative particles in electric discharge
Electron Discovery
Identified via cathode-ray experiments
Watermelon Analogy
Positively charged pulp with embedded seeds (electrons)
Test your knowledge with 11 questions on Fundamentals of Atomic Structure and Models.
1. Which statement best describes Dalton’s contribution to atomic theory in 1808?
2. What are parmanus in ancient Indian thought and how do they differ from atomos in Greek philosophy?
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