Atomic Structure Timeline • Use the following information to complete the lecture handout. • On tomorrow’s quiz, you will be expected to… – draw the atomic models – match scientists to their experiments and discoveries – place the models in chronological order
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Atomic Structure Timeline Use the following information to complete the lecture handout. On tomorrow’s quiz, you will be expected to… –draw the atomic.
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Atomic Structure Timeline
• Use the following information to complete the lecture handout.
• On tomorrow’s quiz, you will be expected to…– draw the atomic models– match scientists to their experiments and
discoveries– place the models in chronological order
Democritus (400 B.C.)
• Proposed that matter was composed of tiny indivisible particles
• Not based on experimental data
• Greek: atomos
Alchemy (next 2000 years)
• Mixture of science and mysticism. • Lab procedures were developed, but alchemists did not
perform controlled experiments like true scientists.
John Dalton (1807)
• British Schoolteacher– based his theory on others’
experimental data
• Billiard Ball Model– atom is a
uniform, solid sphere
John Dalton
Dalton’s Four Postulates
1. Elements are composed of small indivisible particles called atoms.
2. Atoms of the same element are identical. Atoms of different elements are different.
3. Atoms of different elements combine together in simple proportions to create a compound.
4. In a chemical reaction, atoms are rearranged, but not changed.
Henri Becquerel (1896)
• Discovered radioactivity– spontaneous emission of