Periodic Table

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Across
  1. 4. the name for rows on the periodic table
  2. 6. the group that includes elements 57-71
  3. 12. the heaviest noble gas
  4. 14. a negatively charged subatomic particle
  5. 15. a positively charged subatomic particle
  6. 16. electrons in the outermost energy level
  7. 17. a group on the periodic table that looks like a stair step
  8. 19. the group located in group 17
  9. 20. the group of elements located to the left of the metalloids
Down
  1. 1. a group of elements with the same number of valence electrons
  2. 2. a neutrally charged subatomic particle
  3. 3. number that denotes the number of protons in an atom
  4. 5. the heaviest alkaline earth metal
  5. 7. elements in blocks 3-12
  6. 8. the group that includes oxygen and nitrogen
  7. 9. the name for columns on the period table
  8. 10. the element with 15 protons
  9. 11. denotes elements that use the same orbitals to hold their valence electrons
  10. 13. the name for group 1 elements
  11. 18. the element with a mass of 197