Chapter 9

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Across
  1. 2. Weight average mass of the naturally occurring isotopes of an element
  2. 3. Levels any of the possible energies an electron may have in an atom
  3. 6. have no electrical charge
  4. 7. two atoms with different numbers of neutrons
Down
  1. 1. electrons an electron in the outermost energy level of an atom
  2. 4. have a negative electrical charge (-)
  3. 5. have a positive charge (+)
  4. 7. an atom that carries an electrical charge