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Ch. 4 Review

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
Created by: asc1892