Models of the Atom Notes 2019.notebook 1 November 18, 2019 Oct 206:39 PM Models of the Atom Dalton Thompson Rutherford Bohr Modern Model ("Wave‐Mechanical" Model) Aim: To discuss the scientists and their contributions to the current atomic model. Focus: Rutherford's Gold Foil Experiment Dalton Thompson Rutherford Bohr "WaveMechanical" Model (Modern Model) Oldest Current Bill Nye Atoms Bill Nye Atoms and Molecules Sep 221:18 PM contains electrons within their orbitals. Nucleus Electron in principle energy level
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Models of the Atom Notes 2019.notebook€¦ · Models of the Atom Notes 2019.notebook 4 November 18, 2019 Oct 224:53 PM J.J Thompson's Plum Pudding Model 1897 Plum Pudding Model‐
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Models of the Atom Notes 2019.notebook
1
November 18, 2019
Oct 206:39 PM
Models of the Atom
DaltonThompsonRutherfordBohr Modern Model ("Wave‐Mechanical" Model)
Aim: To discuss the scientists and their contributions to the current atomic model.
• Democritus was a greek philosopher who developed the first atomic theory.
• States that matter is made up of very small, internal, indivisible parts, called atoms.
• He believed that atoms only differed in shape and size but were all identical. He thought everything was the same element.
• What was incorrect about Democritus' model? What was missing?
Oct 209:18 PM
Dalton's Atomic Theory
1) All elements are composed of atoms2) All atoms of a given element are identical 3) Atoms of the same element have the same mass4) Compounds consist of two or more elements combined in a fixed proportion. Ex: Water (H2O) is ALWAYS 2 atoms of hydrogen bonded to 1 atom of oxygen.5) Chemical reactions occur when atoms are rearranged
Models of the Atom Notes 2019.notebook
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November 18, 2019
Oct 209:18 PM
John Dalton's Model Early 1800's
The atom was a dense, hard, indivisible sphere with no subatomic particles.
When Dalton developed his model no one knew subatomic particles existed.
• How was Dalton's model incorrect? What was missing?
Nov 102:06 PM
A beam of particles was fired through two charged plates. The beam attracted towards the positive charge. Therefore Thomson concluded all atoms have a negatively charged particle.