Particle crossword

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Across
  1. 3. A positively charged subatomic particle.
  2. 7. A negatively charged subatomic particle.
  3. 8. Fundamental constituent of matter.
  4. 9. The central core of an atom.
  5. 10. A particle representing a quantum of light.
Down
  1. 1. The smallest unit of a chemical element.
  2. 2. The antimatter counterpart of an electron.
  3. 4. A group of atoms bonded together.
  4. 5. A subatomic particle with no charge.
  5. 6. An atom or molecule with electric charge.