Nano crossword

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Across
  1. 2. How easily a substance reacts with others.
  2. 4. Atoms of the same element with different numbers of neutrons.
  3. 7. An element found in all living things.
  4. 8. A negatively charged particle around the nucleus.
  5. 11. The smallest unit of an element.
  6. 12. A neutral particle in the nucleus.
Down
  1. 1. force The force between charged particles.
  2. 3. A positively charged particle in the nucleus.
  3. 5. The outside area of an object.
  4. 6. Simple Crossword Clue
  5. 7. The electric property of a particle (positive or negative).
  6. 9. A prefix meaning one billionth.
  7. 10. The amount of space an object takes up.