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Chemistry
Ch. 4 Review
Question | Answer |
---|---|
atom | smallest particle of an element that retains its identity in a chemical reaction |
Democritus's Atomic Philosophy | believed that atoms were indivisible and indestructible |
Dalton Atomic Theory | transformed Democritus's ideas on atoms into a scientific theory |
Thomson | discovered the electron. |
electrons | are negatively charged subatomic particles |
Ernest Rutherford | proposed that the atom is mostly empty space, thus explaining the lack of deflection of most of the alpha particles |
nucleus | is the tiny central core of an atom and is composed of protons and neutrons |
mass number | total number of protons and neutrons in an atom |
atomic number | is the number of protons in the nucleus of an atom of that element |