Atomic Timeline
Published on Nov 25, 2015
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PRESENTATION OUTLINE
20TH CENTURY
- Electrons paths cannot be predicted.
- Electrons are found in electron clouds, not paths.
1913
- Electrons travel in definite paths.
- Electrons jump between levels from path to path.
Photo by sc63
1911
- He conducted the gold foil experiment.
- There is a small, dense, positively charged nucleus.
- Most of an atom's mass is in the nucleus.
- Atoms contain mostly empty space.
- Electrons move in empty space in the atom.
1897
- There are small, negatively charged particles inside an atom.
- He conducted the cathode-ray tube experiment.
- His theory of atomic structure led to the "plum-pudding" model.
Photo by Science Museum London
1803
- Atoms of the same element are exactly alike.
- He conducted experiments in combining elements.
- Atoms of different elements are different.
- Elements combine in specific proportions.
Photo by fiddle oak
440 B.C.
- Atoms are "uncuttable."
- Atoms are small, hard particles.
- All substances are made of atoms.
- Atoms constantly move.
Photo by Leo Reynolds
