UNIT 3 VOCABULARY MATCHING

WORD BANK
(A) electron            (B) neutron            (C) proton            (D) atomic number
(E) mass number     (F) isotope             (G) nucleus          (H) Dalton
(I) electron cloud     (J) Thomson          (K) Bohr               (L) Rutherford

____ 1.) center part of an atom; contains almost all of the mass of an atom

____ 2.) equal to the number of protons in an atom; whole number on the Periodic Table

____ 3.) equal to the number of protons plus the number of neutrons in an atom

____ 4.) discovered the electron using a cathode ray tube

____ 5.) atoms of the same element, but have different masses

____ 6.) negatively-charged subatomic particle

____ 7.) part of the atom that surrounds the center; accounts for almost all of the volume of an atom

____ 8.) discovered the nucleus with the gold foil experiment

____ 9.) positively-charged subatomic particle

____ 10.) established that atoms of one element are not changed into atoms of another element in a
               chemical reaction

____ 11.) hypothesized that electrons travel around the center of the atom in particular paths

____ 12.) subatomic particle with no charge

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