Chapter 9 Crossword

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Across
  1. 2. Number of protons plus the number of neutrons.
  2. 4. Creator of the periodic table
  3. 6. Number of protons in the nucleus of an atom.
  4. 9. Any of the possible energies an electron may have in an atom.
  5. 10. Particles with a positive charge and are located in the nucleus.
Down
  1. 1. Electrons in the outermost energy level of an atom.
  2. 3. Average mass of the naturally occuring isotopes of an element.
  3. 5. Columns on the periodic table
  4. 7. Tiny, very light particles with a negative electrical charge.
  5. 8. Particles in the nucleus with no electrical charge.
  6. 10. Rows on the periodic table