chemistry

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