chemistry

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Across
  1. 5. contains two or more substances that are not chemically combined
  2. 6. outer layers of an atom made up of energy levels
  3. 8. what has a positive charge
  4. 9. what is two or more atoms bonded together
  5. 10. substances you end with after the chemical reaction
  6. 11. the smallest unit of matter
  7. 12. protons plus neutrons equal
Down
  1. 1. what has negative charge
  2. 2. a substance composed of two or more elements
  3. 3. what has a neutral charge (no charge )
  4. 4. substance that consist of atoms that have same number of protons
  5. 7. substances you start with before the chemical reaction