Ethan Loeffler- Chapter 9

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Across
  1. 6. = equal to the number of protrons plus neutrons
  2. 7. move around the outside of the nucleus and have a negative electrical charge
  3. 8. electrons move in definite orbits around the nucleus
  4. 10. = the number of protrons
Down
  1. 1. located in the nucleus of the atom and have a positive charge
  2. 2. an electron in the outermost energy level of an atom
  3. 3. located in the nucleus of the atom and have no electrical charge
  4. 4. a listing of all the known elements with their atomic masses, atomic numbers, and atomic symbols
  5. 5. the designer of the periodic table of elements
  6. 9. discovered the neutron