Atom History
Geysi Ramirez-Vargas
Created on September 23, 2024
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Transcript
Timeline
History of Atomic Theory
Democritus
~400 BC
Matter = Made up of tiny individual particle “atomos”
Democritus
~400 BC
John Dalton
1803
John Dalton
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
1803
J. J. Thomson
1897
J. J. Thomson
Electrons using a cathode ray tube.
Robert Millikan 1909
Robert Millikan 1909
Oil drop experiment - the charge of a single electron
Ernest Rutherford1911
Ernest Rutherford1911
Dense, positively charged center within the atom called the nucleusGold 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 atomEnergy of the electrons is quantized.
James Chadwick 1932
James Chadwick 1932
Rutherford’s data ->presence of neutral particle in the nucleus
Schrödinger1933
Electrons can act like particles and waves (just like light)Electrons occupy orbitals.
Schrödinger1933
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