Atoms & Periodic Table Crossword

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Across
  1. 4. gaseous element with an atomic mass of 20amu
  2. 7. the element with the highest atomic number
  3. 9. calculated by adding protons and neutrons
  4. 12. the element with 29 protons
  5. 13. columns on the periodic table
  6. 14. element in period 6 with 86 protons
  7. 16. the negatively-charged subatomic particle
  8. 17. the element found in group 2, period 6
  9. 18. the element with atomic number 18
Down
  1. 1. how we refer to an atom with zero charge
  2. 2. is always the same as the number of protons
  3. 3. how many neutrons most sodium atoms will have
  4. 5. the element with one more proton than sulfur
  5. 6. the smallest element on the periodic table
  6. 8. the only metal that is liquid at room temperature
  7. 10. the element with 26 electrons when it's neutral
  8. 11. the element found in group 14, period 3
  9. 15. rows on the periodic table