Atomic Theoryists Flashcards

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1
Q

What did Democritus say(4)

A

•atoms are small, hard particles. • uncuttable• constantly moving• atoms are made up of a single material and form into different shapes and sizes

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2
Q

When was dalton

A

1803

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3
Q

What did dalton say(7)

A

•atoms of different elements are different• combined elements• atoms of the same element are exactly alike.• all substances made of atoms. • elements combine in specific proportions. • atoms can’t be created, divided, or destroyed

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4
Q

When was Thomson

A

1897

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5
Q

What did Thomson say(6)

A

• negatively charged particles in atoms. • cathode ray tube experiment.• plum pudding model• he called negatively charged particles corpuscles• he didn’t know where negative or positive charged particles were so he called it plum pudding• atoms can be divided into smaller pieces

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6
Q

When was Rutherford

A

1911

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7
Q

Rutherford(7)

A

•gold foil• results of gold foil show that plum pudding isn’t accurate• nucleus• most of atoms mass is the nucleus• atoms contain mostly empty space• electrons move in empty space• nucleus is at center of atom and surrounded by empty space

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8
Q

When was Bohr

A

1913

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9
Q

Bohr(3)

A

• electrons jump between levels from path to path• electrons travel in different paths •electron paths are found in levels at certain distances from nucleus;no path between levels

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10
Q

When was Schrodinger/ Heisenberg

A

1926

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11
Q

Schrodinger/ Heisenberg

A

• electron paths can’t be predicted• electrons are found in electron clouds, not paths• electron clouds are related to the paths in bohrs model• electron clouds are certain regions inside atoms where electrons can be found

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12
Q

When was Democritus

A

440 BC

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