The Periodic Table

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Across
  1. 3. Has a negative charge
  2. 7. A chart used to organize elements
  3. 10. A group of atoms
  4. 11. Carries a positive charge
  5. 12. Chemically joined elements
  6. 16. Has no charge
  7. 17. The center of an atom
  8. 18. The state of matter that room temperature water is in
  9. 19. Another word for group
  10. 20. The state of matter that ice is in
Down
  1. 1. Smallest particle of an element
  2. 2. Both a metal and nonmetal
  3. 4. A basic substance
  4. 5. Anything with mass and volume
  5. 6. Good conductors of heat
  6. 8. The region surrounding the nucleus
  7. 9. The number of protons
  8. 13. A horizontal row of elements of the periodic table
  9. 14. Poor conductors of heat
  10. 15. The amount of matter an object has