Matter.

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Across
  1. 2. They conduct negative energy.
  2. 5. are ions which conduct negative energy.
  3. 6. the form or outline of a item.
  4. 8. Atoms that are spread apart.
Down
  1. 1. change's shape depending on the area.
  2. 3. Maintains it's own shape.
  3. 4. In of everything.
  4. 7. They make up everything.