history of the atom Flashcards

1
Q

what did thompson discover and when

A

electrons in 1897

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2
Q

what model did thompson come up with

A

plum pudding model

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3
Q

describe the plum pudding model

A

negative electrons embedded in positively charged matter

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4
Q

what was the first model of the atom

A

a sphere that was tiny and coudn’t be discovered

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5
Q

what did rutherford discover and when

A

nucleus in 1911

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6
Q

what model did rutherford come up with

A

nuclear model

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7
Q

describe the nuclear model

A

positively charged nucleus surrounded by negatively charged electrons

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8
Q

how did rutherford discover the nucleus

A

gold foil experiment

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9
Q

describe the gold foil experiment

A

alpha particles were fired at a one atom thick layer of gold foil. some rebounded, some reflected and some passed through completely

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10
Q

what did bohr discover and when

A

electron shells in 1913

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11
Q

describe bohrs findings

A

he realized there was two electrons in the outer shell and eight on each after.

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12
Q

what did a group of scientists discover and when

A

the proton in 1920

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13
Q

describe the group of scientists findings

A

the nucleus contains many positive protons

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14
Q

what did chadwick discover and when

A

neutrons in 1932

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15
Q

describe chadwicks findings

A

he found that there was no charge neutrons in the nucleus as well as the protons

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