1. Chem Quiz U2 (Atomic Theory)

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people & discoveries

Last updated 3:04 AM on 9/18/26

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8 Terms

1

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<p>Democritus </p>

Democritus

-Ancient Greek Philosopher

-Discovered the Particle Theory of Matter

—> Atom = smallest particles of an element that retains its identity in a chem reaction

-Coined term “atoms”

<p>-Ancient Greek Philosopher</p><p>-Discovered the <span><strong>Particle Theory of Matter</strong></span></p><p><span>—> Atom = smallest particles of an element that retains its identity in a chem reaction</span></p><p><span>-Coined term “atoms”</span></p>

2

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<p>John Dalton</p>

John Dalton

-Proposed the Solid Sphere Model

-Matter is made up of invisible atoms

-Atoms of a given element are identical in size, mass etc

-Atoms are combined, separated, or rearranged in chem reactions

(Dolly is a sphere)

<p>-Proposed the <mark data-color="#9ca90b" style="background-color: rgb(156, 169, 11); color: inherit;">Solid Sphere Model</mark></p><p>-Matter is made up of <mark data-color="#857d08" style="background-color: rgb(133, 125, 8); color: inherit;">invisible atoms</mark></p><p>-Atoms of a given element are identical in size, mass etc</p><p>-Atoms are combined, separated, or rearranged in chem reactions </p><p></p><p>(Dolly is a sphere)</p>

3

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<p>J.J Thompson</p>

J.J Thompson

-Proposed Plum Pudding Model

-Cathode Ray Tube experiment

-Led to discovery of an electron

<p>-Proposed <mark data-color="#7e7f04" style="background-color: rgb(126, 127, 4); color: inherit;">Plum Pudding Model </mark></p><p>-<mark data-color="#696c07" style="background-color: rgb(105, 108, 7); color: inherit;">Cathode Ray</mark> Tube experiment</p><p>-Led to discovery of an <mark data-color="#8d8106" style="background-color: rgb(141, 129, 6); color: inherit;">electron </mark></p>

4

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<p>Ernest Rutherford </p>

Ernest Rutherford

-Proposed Nuclear Model

-Gold Foil Experiment

-volume of atom is empty space

-Discovery of nucleus

-A densely packed positives core contains most of atoms mass

<p>-Proposed <mark data-color="#716902" style="background-color: rgb(113, 105, 2); color: inherit;">Nuclear Model</mark></p><p>-<mark data-color="#725b06" style="background-color: rgb(114, 91, 6); color: inherit;">Gold Foil</mark> Experiment</p><p>-volume of atom is empty space</p><p>-Discovery of <mark data-color="#676608" style="background-color: rgb(103, 102, 8); color: inherit;">nucleus</mark></p><p>-A densely packed positives core contains most of atoms mass</p>

5

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<p>Niels Bohr </p>

Niels Bohr

-Proposed Planetary model

-This model only works for hydrogen atoms

-electrons orbit the nucleus at fixed energy levels

-orbits further away from the nucleus exist at higher

<p>-Proposed <mark data-color="#616402" style="background-color: rgb(97, 100, 2); color: inherit;">Planetary</mark> model</p><p>-This model only works for hydrogen atoms</p><p>-<mark data-color="#5e4e07" style="background-color: rgb(94, 78, 7); color: inherit;">electrons orbit</mark> the nucleus at <mark data-color="#595d00" style="background-color: rgb(89, 93, 0); color: inherit;">fixed energy levels</mark></p><p>-orbits further away from the nucleus exist at higher</p>

6

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<p>Erwin Schrodinger</p>

Erwin Schrodinger

-Proposed Quantum Model (QUANdaleDINGle)

-electrons are found in orbitals

-Heisenberg Uncertainty Principle

—> an electrons position & velocity can’t be determined at same time

<p>-Proposed <mark data-color="#545e01" style="background-color: rgb(84, 94, 1); color: inherit;">Quantum Model </mark>(QUANdaleDINGle)</p><p>-electrons are found in <mark data-color="#4e6104" style="background-color: rgb(78, 97, 4); color: inherit;">orbitals </mark></p><p>-<mark data-color="#5b5e03" style="background-color: rgb(91, 94, 3); color: inherit;">Heisenberg Uncertainty </mark>Principle</p><p>—> an electrons position & velocity can’t be determined at same time </p>

7

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<p>James Chadwick</p>

James Chadwick

-Discovered the
neutron

-showed neutron was in the nucleus

<p>-Discovered the <br><mark data-color="#66001D" style="background-color: rgb(102, 0, 29); color: inherit;">neutron</mark> </p><p>-showed neutron was <mark data-color="#530404" style="background-color: rgb(83, 4, 4); color: inherit;">in the nucleus </mark></p>

8

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<p>Robert Milikan</p>

Robert Milikan

-Conducted Oil Drop Experiment

-Electrons are in atoms of all elements

-Calculated the charge & mass of an electron

<p>-Conducted Oil Drop Experiment </p><p>-Electrons are in atoms of all elements</p><p>-Calculated the charge & mass of an electron </p>