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Atomic Structure The Atom: From Philosophical Idea to Scientific Theory Democritus Dalton’s Atomic Theory Atomic Structure How our understanding of the atom has changed: 1803 Dalton 1904 Discovery of the electron 1911 Discovery of the nucleus 1913 Electron orbits 1913 Electron clouds Summary of subatomic structure Atomic Structure Distinguishing between atoms Atomic Number Mass Number Determining subatomic structure Atomic Structure IONS Ions: Examples Symbol Atomic # Mass # # of protons # of neutrons # electrons charge Atomic Structure Isotopes Atomic Mass Calculating Atomic Mass Calculating Atomic Mass: Sample problem
