The Periodic Table!

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Across
  1. 5. Add protons + neutrons to get the...?
  2. 8. Is its own family.
  3. 12. The one or two letter abbreviation of an element.
  4. 13. The outermost electrons of an atom.
  5. 15. The official chart that organizes all elements currently discovered.
  6. 16. Identifies the number of protons and electrons.
  7. 17. Good conductors of heat and electricity.
  8. 18. Columns on the periodic table that have similar properties.
  9. 19. ­Group 3­-12 on the periodic table.
Down
  1. 1. The most reactive elements.
  2. 2. Rows on the periodic table that tells you how many valance electrons there are.
  3. 3. In the nucleus, positive charge.
  4. 4. In the nucleus, no charge.
  5. 6. Poor conductors of heat and electricity.
  6. 7. A reaction to another element/atom
  7. 9. The center of an atom.
  8. 10. Orbits the nucleus.
  9. 11. Have both properties of metals and nonmetals.
  10. 14. The most unreactive gases, group 18 on the periodic table.