Periodic Table Crossword

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Across
  1. 5. rows on the periodic table
  2. 6. how we refer to an atom with zero charge
  3. 7. the element with 29 protons
  4. 11. columns on the periodic table
  5. 12. the charge of an ion with 8 protons and 7 electrons
  6. 15. is always the same as the number of protons
  7. 17. the number of neutrons most sodium (Na) atoms will have
  8. 18. the element in group 18, period 6
  9. 19. the element with one more proton than sulfur (S)
  10. 20. gaseous element with an atomic mass of 20amu
Down
  1. 1. the smallest element on the periodic table
  2. 2. calculated by adding protons and neutrons
  3. 3. the element that has 26 electrons when neutral
  4. 4. the element in group 14, period 3
  5. 5. the element with atomic number 15
  6. 8. the negatively-charged subatomic particle
  7. 9. element with highest atomic number on PT
  8. 10. the only metal that is liquid at room temperature
  9. 13. the element found in group 2, period 4
  10. 14. what we call an atom that is NOT neutral
  11. 16. the only nonmetal that is liquid at room temperature