Chemistry vocab review

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Across
  1. 5. small number in a chemical formula that indicated the number of atoms of that element
  2. 6. horizontal row on the periodic table
  3. 11. electron found in the outermost energy level
  4. 12. subatomic particle with a negative charge
  5. 13. type of element found on the left side of the zig zag line on the periodic table
  6. 14. substance made of only one type of atom
  7. 16. substance made of two or more types of atoms that are chemically attached
  8. 17. reaction that gives off heat
  9. 19. property that can be observed without changing the identity of the substance
  10. 20. subatomic particle that creates chemical bonds
  11. 22. "ring" where electrons are likely to be found
  12. 23. type of element touching the zig zag line of the periodic table
  13. 24. reaction that absorbs heat
Down
  1. 1. vertical column on the periodic table
  2. 2. state of matter with the highest kinetic energy
  3. 3. substance created in a chemical reaction
  4. 4. property that is observed when a substance changes into something new
  5. 7. element with 17 protons
  6. 8. change from a gas to a liquid
  7. 9. number of energy levels in an atom of uranium
  8. 10. large number in front of a chemical formula
  9. 15. substance with two more things that are not chemically attached
  10. 18. number of valence electrons in helium
  11. 19. subatomic particle in the nucleus with a positive charge
  12. 21. substance at the start of a chemical reaction