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Atom History

Geysi Ramirez-Vargas

Created on September 23, 2024

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Transcript

Timeline

History of Atomic Theory

Democritus

~400 BC

Democritus

Matter = Made up of tiny individual particle “atomos”

~400 BC

John Dalton

1803

John Dalton

1803

1. Matter is made up of atoms that are indivisible and indestructible. 2. All atoms of an element are identical. 3. Atoms of different elements have different weights and different chemical properties. 4. Atoms of different elements combine in simple whole numbers to form compounds

J. J. Thomson

1897

J. J. Thomson

Electrons using a cathode ray tube.

Robert Millikan 1909

Oil drop experiment - the charge of a single electron

Robert Millikan 1909

Ernest Rutherford 1911

Ernest Rutherford 1911

Dense, positively charged center within the atom called the nucleus Gold Foil (alpha particle) experimentAlpha & Beta Particles

Niels Bohr 1922

Niels Bohr 1922

Bohr’s Orbit Model Electrons orbit the nucleus. Model based on the hydrogen atom Energy of the electrons is quantized.

James Chadwick 1932

James Chadwick 1932

Rutherford’s data -> presence of neutral particle in the nucleus

Schrödinger 1933

Schrödinger 1933

Electrons can act like particles and waves (just like light) Electrons occupy orbitals.

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