chemistry

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Across
  1. 3. the smallest unit of matter?
  2. 5. horizontal rows
  3. 9. stable subatomic particle with a charge of negative electricity
  4. 10. A positive ion known as?
Down
  1. 1. Vertical columns
  2. 2. the number of neutrons and protons in the nucleus of an atom
  3. 4. loose electrons during a chemical reaction
  4. 6. Electrons orbit the nucleus of an atom in?
  5. 7. A negative ion is known as?
  6. 8. The number of protons in an atom