chapter 4 structure of the atom (people)

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Democritos

matter is made of small indestructible units called atom, no data to back this up

Aristotle

matter is continuous (no smallest particle of matter)

John Dalton

stated that all matter consists of tiny particles

John Dalton

stated that atoms are indestructible and unchangeable

John Dalton

stated that elements are characterized by the mass of their atoms

J.J. Thomson

stated that electrons have negative charge

J.J. Thomson

created the plumbing model

plumbing model

showed matter containing evenly distributed positive charge with electrons distributed out

Rutherford

gold foil experiment

gold foil experiment

alpha particles were aimed at gold foil, zinc sulfide around gold flashed when alpha particle hit

Rutherford

discovered plum pudding model incorrect

Chadwick

discovered the neutron

Henry Moseley

discovered that the number of protons could define that element

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