Atomic Theory Scientists

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Last updated 5:11 PM on 6/4/26
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14 Terms

1
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Democritus

Atomos are invisible and uncuttable

Different shapes and sizes

Matter is made of "atomos"

<p>Atomos are invisible and uncuttable</p><p>Different shapes and sizes</p><p>Matter is made of "atomos"</p>
2
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John Dalton

Atoms of the same element are exactly alike and atoms of different elements are different

<p>Atoms of the same element are exactly alike and atoms of different elements are different</p>
3
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Aristotle

Proposed that matter is made of the 4 "elements": Earth, water, fire, and air. "Killed" the field of Chemistry since no one really questioned him for about 2000 years!

<p>Proposed that matter is made of the 4 "elements": Earth, water, fire, and air. "Killed" the field of Chemistry since no one really questioned him for about 2000 years!</p>
4
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JJ Thomson

Thought that atoms are made of positively charged material with negative particles throughout

<p>Thought that atoms are made of positively charged material with negative particles throughout</p>
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Ernest Rutherford

Atoms are mostly a void with a couple of electrons, most of the mass is in the nucleus

<p>Atoms are mostly a void with a couple of electrons, most of the mass is in the nucleus</p>
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Niels Bohr

Electrons must move around the nucleus like the planets move around the sun!

<p>Electrons must move around the nucleus like the planets move around the sun!</p>
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Modern Scientists (Schrödinger & Heisenberg)

Electrons move around in a cloud not in distinct paths

<p>Electrons move around in a cloud not in distinct paths</p>
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Democritus

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John Dalton

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Aristotle

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JJ Thomson

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12
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Ernest Rutherford

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Niels Bohr

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Modern Scientists (Schrödinger & Heisenberg)

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