Matter

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Across
  1. 2. a subatomic particle that has a positive charge
  2. 4. a measure of a body or a region in a 3-D space
  3. 7. smallest unit of a substance
  4. 8. subatomic particle that has no charge
  5. 10. a substance that cannot be separated or broken down
Down
  1. 1. smallest unit of an element
  2. 3. anything that has mass and takes up space
  3. 5. matter can only be transformed
  4. 6. a subatomic particle that has a negative charge
  5. 9. atom's central region