Periodic Table Crossword

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Across
  1. 3. atomic number 79
  2. 4. A substance that has a unique atomic number on the periodic table.
  3. 5. atomic number 13
  4. 8. atomic number 4
  5. 10. negatively charged atom
Down
  1. 1. found in group 1 of the periodic table
  2. 2. number of protons in the nucleus
  3. 6. A fundamental substance that has a unique atomic number on the periodic table.
  4. 7. A molecule containing two or more different atoms bound together
  5. 9. positively charged ion