Chase Tic Tac Toe

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Across
  1. 1. a substance formed by a chemical reaction
  2. 3. a solid substance that forms as a result of a chemical reaction
  3. 5. the number of protons in the nucleus
  4. 9. the total number of protons and neutrons in the nucleus
  5. 11. a negatively charged particle outside of the nucleus
  6. 12. a substance that cannot be broken down into a simpler substance by ordinary chemical changes
  7. 14. a horizontal row in the table of elements
  8. 15. increases chemical reaction but is not itself consumed in the reaction
  9. 16. a group of atoms that are held together by covalent bonds
  10. 18. a vertical column in the table of elements
  11. 20. an atom or group of atoms that have a positive or negative charge
  12. 21. denoting a process involving substances in different phases
Down
  1. 2. a substance that is present at the beginning of a chemical reaction and is changed into a new substance
  2. 3. changes affecting the form of a chemical substance but not its chemical composition
  3. 4. law stating that atoms cannot be created or destroyed in a chemical reaction
  4. 6. occurs when two substances combine to create a new substance
  5. 7. a number written slightly below and to the right of a chemical symbol that shows how many atoms of the element are in a compound
  6. 8. an atom of an element that has a different number of neutrons than another atom of the same element
  7. 10. a particle inside the nucleus that has no charge
  8. 13. a positively charged particle inside the nucleus
  9. 15. the number before a chemical formula that indicates how many molecules are involved in a chemical reaction
  10. 16. a combination of two or more substances that do not combine chemically
  11. 17. substances and mixtures that are in one single phase
  12. 19. a substance formed by two or more different types of atoms bonding together