Mitchell Holmes CH.9 S2 Crossword

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Across
  1. 2. Has a positive electrical charge
  2. 5. Has a negative electrical charge
  3. 6. An electron in the outermost energy level of an atom
  4. 9. Average mass of the naturally occurring isotopes of an element
  5. 10. Number of protons
Down
  1. 1. Any of the possible energies an electron may have in an atom
  2. 3. Has no electrical charge
  3. 4. Used for things that are too small or too large to be observed
  4. 7. Equal to the number of protons plus neutrons
  5. 8. The model used to map a picture of an element or atom