Chemical reactions

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Across
  1. 3. an element or substance that is not metal
  2. 4. a substance that undergos a chemical change
  3. 6. chemical bond formed by sharing electrons
  4. 7. a subatomic particle with a negative charge
  5. 8. an example of a physical change
  6. 11. the total number of protons and neutrons in a nucleus
  7. 12. number of protons in the nucleus of an atom
  8. 13. what is formed after a chemical reaction occurs
  9. 14. atom or group of atoms that has a positive or negative charge
  10. 15. the bonding process that involves gaining or losing electrons by transferring
  11. 16. a change in matter that produces one or more new substances
Down
  1. 1. electrons in the outermost shell that has a part in the bonding process
  2. 2. a subatomic particle in the nucleus with a positive charge
  3. 5. substances that form when atoms from two or more elements bond together
  4. 9. a subatomic particle with a neutral charge
  5. 10. an example of a chemical change
  6. 13. a change that alters the for or appearance of a substance
  7. 17. neutral group of atoms joined by covalent bonds