Year 10 science crossword puzzle

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Across
  1. 2. dioxide an example of a covalent compound
  2. 5. metal all metals in group one of the periodic table
  3. 6. a negatively charged ion
  4. 7. bond attraction between a cation and an anion
Down
  1. 1. bond sharing of elections between two or more non-metals
  2. 2. a positively charged ion
  3. 3. group one element of the periodic table
  4. 4. fluoride an example of an ionic compound