Chapter 9

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Across
  1. 2. rule of Bohr models; list protons, neutrons, and electrons
  2. 5. Mass number equal to the number of protons plus neutrons
  3. 6. no electrical charge
  4. 8. rule of Bohr models; design the nucleus
  5. 10. an electron in the outermost energy level of an atom
Down
  1. 1. two atoms with different numbers of neutrons
  2. 3. have a negative charge
  3. 4. have a positive charge
  4. 7. an atom that carries an electrical charge
  5. 9. Levels any of the possible energies an electron may have in an atom