ch. 9 Layne Vance

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Across
  1. 3. number of protons in a neutral atom
  2. 6. an electron in the outermost energy level of an atom.
  3. 8. most reliable model
  4. 9. no electrical charge
  5. 10. An atom that carries an electrical charge
Down
  1. 1. equal to the number of protons plus neutrons
  2. 2. have a negitive electrical charge
  3. 4. two atoms with different numbers of neutrons
  4. 5. sometimes called the wave model
  5. 7. average mass of the naturally occurring isotopes of an element