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Science Chapter 4 (=
Question | Answer |
---|---|
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 |