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Chapter 4 Study Guide Know definitions for the following vocabulary words: matter spectral line atom energy level nucleus electron cloud proton electromagnetic spectrum neutron charge electron Thomson’s atomic model proportion Rutherford’s atomic model Democritus Bohr’s atomic model Dalton element Lavoisier atomic number Law of Conservation of mass periodic table mass number isotope radioactive isotope average atomic mass ion Law of definite proportions Know the order in which the atomic models were created from first created to most recent What important discoveries did Rutherford’s gold foil experiment reveal about atoms? How do you find the number of neutrons in an element given a periodic table? Know how to read the periodic table (what information is given to you in each element square?). How does an ion form? How does a negative ion form? How does a positive ion form? How many electrons fit in the first energy level? How many electrons fit energy level 2? How many electrons fit in energy level 3? What does it mean if an atom “completes the octet”?
