Matter 2 Key Words Crossword

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Across
  1. 2. Element with atoms made of only one proton and one electron.
  2. 7. Group containing lithium and sodium.
  3. 9. Subatomic particle with a positive charge.
  4. 10. Where in the atom are the protons and electrons found?
  5. 11. Metal more reactive than sodium - purple flame.
  6. 14. Subatomic particle with a negative charge.
  7. 15. Row on the periodic table.
  8. 17. The smallest part of an element.
  9. 18. Group containing fluorine and chlorine.
Down
  1. 1. Column on the periodic table.
  2. 3. Number of protons in a sodium atom.
  3. 4. Also known as "proton number". (2)
  4. 5. Mass number of a carbon atom.
  5. 6. Most reactive element in group 7.
  6. 8. A substance made from two or more different types of atom chemically joined.
  7. 12. Also known as "RAM." (2)
  8. 13. Subatomic particle with no charge (neutral).
  9. 16. A substance made from only one type of atom.