Periodic Table

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Across
  1. 1. the area around the center of an atom where negatively charged particles circulate
  2. 4. group 17 on the periodic table which is very reactive with groups 1 and 2
  3. 7. the elements that have properties of both metals and nonmetals
  4. 8. uncharged or neutrally charged particles
  5. 10. the total number of protons and neutrons in an atom's nucleus
  6. 13. group 1 on the periodic table which is very reactive with group 17
  7. 14. group 18 on the periodic table which is very stable, colorless and odorless, and also called inert gases because they almost never react with other
Down
  1. 2. negatively charged particles
  2. 3. a horizontal row on the periodic table
  3. 5. the number of protons in the nucleus of an atom
  4. 6. the elements to the right side of the periodic table which have properties that are the opposite of metals
  5. 9. positively charged particles
  6. 11. the center of an atom
  7. 12. most of the elements on the periodic table which have properties that are the opposite of nonmetals
  8. 15. a vertical column on the periodic table