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Science Chapter 4 (=

the smallest particle in which an element can be divided and still be the same substance atom
believed all matter consisted of extremely small particles that could not be divided Democritus
Said that all substances came from the four elements water, fire, air, earth. Aristotle
Had the first atomic theory. Proposed a theory that all elements are composed of atoms. Dalton
Elements that the same atomic number but different mass numbers isotope
equals the number of protons atomic number
the sum of protons and neutrons in the nucleus of an atom mass number
conducted the cathode ray tube experiment Thomson
Conducted the gold foil experiment Rutherford
A positively charged subatomic particle. Proton
Negatively charged subatomic particle Electron
A neutral subatomic particle found in the nucleus Neutron
mass number-atomic number=? number of neutrons