ATOMIC STRUCTURE

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Across
  1. 3. a negatively charged particle orbiting the nucleus
  2. 5. has the symbol "O".
  3. 8. a substance made of atoms with the same number of protons
  4. 10. the center of an atom
Down
  1. 1. anything that occupies space and has mass.
  2. 2. a positively charged particle in the nucleus
  3. 4. a particle with no charge in the nucleus
  4. 6. space occupied by an object
  5. 7. the smallest unit of a chemical element
  6. 9. the amount of matter in an object.