Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested...

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History of the Atom Dates are included for a frame of reference.

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Transcript of Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested...

Page 1: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

History of the AtomDates are included for a frame of reference.

Page 2: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Democritus

Around 400 B.C. Atomos => indivisible He suggested that all substance in the

universe was made up of particles so tiny that nothing smaller was possible.

He regarded those particles as unchangeable and indestructible, and as the only content of the universe.

Page 3: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

The “Mocker”

Page 4: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Dalton

1803 Atoms = small, dense, spheres Billiard Ball Model Atomic Theory

Page 5: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Dalton

Page 6: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Dalton’s Atomic Theory

Tiny particles called atoms make up all elements

Atoms of the same element are identical

Compounds are made with whole number ratios of atoms

Chemical reactions are when compounds are broken and reformed

Page 7: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Thomson

1897 Discovered the electron, and they

were negative Cathode Ray Tube experiment Plum pudding model

Immobile electrons

Page 8: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Thomson

Page 9: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Rutherford

1911 Gold Foil Experiment Discovered atom was mostly empty

space Discovered the nucleus

Dense, positive, small, in center Atomic Model

Page 10: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Rutherford

Page 11: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Bohr

1913 Electrons were located in shells

(fixed orbits) Electrons can move to other shells Planetary Model

Page 12: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Bohr

Page 13: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Millikan

1916 Oil-drop experiment

Mass of an electron Exact charge of an electron

Page 14: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Millikan’s Oil Drop Experiment

Page 15: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Schrödinger

1926 Electron cloud of probability Electron Cloud Model

Page 16: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Electron Cloud Model

Page 17: Dates are included for a frame of reference.. Around 400 B.C. Atomos => indivisible He suggested that all substance in the universe was made up.

Chadwick

1932 Discovered the neutron


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