History of the Atom Flashcards by Joanna Meany

Q

Democritus theory

A

matter is made of atoms

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Q

Democritus theory description

A

atoms are indivisible and indestructible

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Q

Aristotle theory

A

matter is made of 4 elements

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Q

Aristotle theory description

A

4 elements are air, earth, fire, water

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Q

Dalton

A

created an atomic theory

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Q

Dalton (1st part)

A

all substances are made of atoms

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Q

Dalton (2nd part)

A

atoms of the same element are exactly alike

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Q

Dalton (3rd part)

A

different elements have different atoms

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Q

Dalton (4th part)

A

atoms combine in certain ratios to form compounds

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Q

Dalton (5th part)

A

atoms cannot be created or destroyed

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Q

Curie

A

thought atom was not solid

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Q

Thomson

A

discovered the electron

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Q

Rutherford

A

discovered the nucleus and proton

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Q

Bohr

A

electrons travel in orbits

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Q

Double-Slit

A

electrons behave like particles and waves

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Q

Heisenberg/Schrödinger

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A

created the Electron Cloud Model

Q

Chadwick

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A

discovered the neutron

Q

Meitner

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A

discovered nuclear fission

Q

Gell-Mann

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A

contributed to Standard Model

Q

Thomson’s experiment

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A

cathode ray experiment

Q

Rutherford’s experiment

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A

gold foil experiment