Electronic Theory by Grace McDonald

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Slide Notes

Electronic Theory

Published on Nov 19, 2015

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PRESENTATION OUTLINE

MODERN THEORY

Electron path cannot be predicted
Electrons are found in electron clouds, not path

BOHR

Electrons jump between levels from path to path.
Electrons travel in definite paths.

RUTHERFORD

Most of an atom's mass is in the nucleus.
He conducted the gold foil experiment.
Electrons move in empty space in the atom.
Atoms are mostly empty space.
There is a small, dense, positively charged nucleus

THOMSON

Elements combine in specific proportions.
His theory of atomic structure led to the "plum pudding" model
He conducted the cathode-ray tube experiment

DALTON

There are small, negatively charged particles inside an atom
Atoms of different elements are different
Atoms of the same element are exactly alike
He conducted experiments combining elements

DEMOCRITUS

Atoms are "uncuttable"
Atoms constantly move.
Atoms are small, hard particles.
All substances are made of atoms

Grace McDonald