Atoms

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Across
  1. 4. A substance made up of only one type of atom.
  2. 9. A particle with zero net charge.
  3. 10. An isotope in which the nucleus is not likely to break apart.
  4. 12. A group of atoms banded together.
  5. 13. The smallest particle of an element.
  6. 14. A very small subatomic particle with a negative net charge.
  7. 15. An atom or molecule with a net charge.
  8. 16. A model of an atom in which electrons move in defined orbits.
  9. 17. A large subatomic particle with a neutral net charge.
  10. 18. The centre part of an atom, with an overall positive charge.
  11. 20. The number of protons and neutrons in an atom.
Down
  1. 1. A particle of matter that is smaller than an atom.
  2. 2. An electrical property of matter.
  3. 3. The overall electrical charge of a particle.
  4. 5. A model of an atom in which electrons move freely.
  5. 6. An isotope in which the nucleus is likely to break apart.
  6. 7. A large subatomic particle with a positive charge.
  7. 8. An atom or molecule with a net negative charge.
  8. 11. The number of protons in an atom.
  9. 19. An atom or molecule with a net positive charge.