Periodic Table and Atoms Science Crossword

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Across
  1. 3. the number of an element on the periodic table (determined by the number of atoms)
  2. 6. a table that contains all the basic elements
  3. 8. particle with a positive charge
  4. 9. particle with a negative charge
Down
  1. 1. a pure substance consisting of atoms
  2. 2. centre of an atom
  3. 4. foundation of elements
  4. 5. particle with neutral/no charge
  5. 7. the mass of an atom