Elements, compounds, mixtures crossword

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Across
  1. 2. the building blocks of everything
  2. 5. chemically connected
  3. 7. shows all of the elements
  4. 8. no charge in an atom
  5. 10. the make up of matter
  6. 11. when they look the same
Down
  1. 1. the positive charge of an atom
  2. 3. the building blocks of matter
  3. 4. when they look different
  4. 6. physically bonded
  5. 9. the negative charge of an atom