Chapter 9 Crossword

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