Element Unit Vocab Crossword

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Across
  1. 2. The only gaseous element to the left of the stair step line
  2. 3. Columns on the periodic table
  3. 5. Elements found to the left of the stair step line
  4. 8. Positive charge in particles
  5. 13. Number of protons + number of neutrons
  6. 14. Metals founding the first group of the periodic table
  7. 15. Number of protons
  8. 16. The only metal not solid at room temperature
  9. 18. Atoms with the same element, but different numbers of neutrons
  10. 19. Elements found on the stair step line
  11. 20. Electrons on the outer ring of the element shell
Down
  1. 1. Group 18 on the periodic table, least reactive
  2. 4. Rows on the periodic table
  3. 6. The smallest part of an element
  4. 7. Elements found to the right of the stair step line
  5. 9. Positively charged center of an atom
  6. 10. Group 17 on the periodic table, most reactive gases
  7. 11. Capital letter, With or without a lowercase accompanying it
  8. 12. Negative charge in particles
  9. 17. Neutral charge in particles