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chemistry:chapter 4

atom the smallest particle of an element that retains the identity of the element
atomic mass the weighted average of the masses of all of an element's isotopes
atomic number the number of protons in an atom
Cathode ray a glowing beam of electrons
Dalton's Atomic Theory the first supporting evidence of the existence of atoms
electron a negatively charged subatomic particle with a negligible mass, found outside the nucleus of an atom
isotopes atoms of an element with different numbers of neutrons and therefore different masses
mass number the number of protons and neutrons in an atom
neutron a neutrally charged subatomic particle found in the nucleus of an atom
nucleus a dense, positively charged, and centrally-located region in the atom
proton a positively charged subatomic particle found in the nucleus of an atom
theory well-tested, scientifically accepted explanation of a broad set of observations
Created by: Maydavis