Periodic Table Crossword

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