casandra mccullough burkholder science crossword

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Across
  1. 2. found widely in nature-rocks, coral reefs
  2. 4. family 1A
  3. 5. group 6A
  4. 6. family 5A
  5. 7. found in nature combined with other elements
  6. 8. designer of the periodic table
  7. 10. side the metals are on
Down
  1. 1. form compounds with oxygen called "oxides"
  2. 3. family 4A
  3. 9. these are often used for things that are too small or too large to be observed or that are too difficult to be understood easily