Chapter 9 Crossword

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Across
  1. 4. Two atoms with different numbers of neutrons are called _______.
  2. 5. equal to the number of protons plus neutrons.
  3. 7. Large and heavy like protons Neutrons have no electrical charge Located in the nucleus of the atom
  4. 8. An atom that carries an electrical charge is called an _______.
  5. 9. average mass of the naturally occurring isotopes of an element
  6. 10. any of the possible energies an electron may have in an atom.
Down
  1. 1. an electron in the outermost energy level of an atom.
  2. 2. Much larger and heavier than electrons Protons have a positive charge (+) Located in the nucleus of the atom
  3. 3. Tiny, very light particles Have a negative electrical charge (-) Move around the outside of the nucleus
  4. 6. number of protons In a neutral atom, the # of protons = the # of electrons