Chapter 9 crossword By: Tommy

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Across
  1. 3. any of the possible energies an electron may have in an atom
  2. 4. equal to the number of protons plus neutrons
  3. 6. has a negative electrical charge
  4. 7. average mass of the naturally occurring isotopes of an element
  5. 9. an element with one proton, zero neutrons, and one electron
  6. 10. the the atomic number for carbon
Down
  1. 1. an electron in the outermost energy level of an atom
  2. 2. has no electrical charge
  3. 5. has a positive electrical charge
  4. 8. the atomic number for lithium