Chemistry crossword

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Across
  1. 2. made of only one type of atom
  2. 4. the number of atoms in HCl
  3. 8. an element with 4 energy levels and 2 valence electrons
  4. 10. two or more atoms chemically bonded together
  5. 11. elements with full outer energy levels
  6. 13. molecules are rearranged to make new molecules
  7. 14. responsible for the identity of the element
  8. 15. all the elements found in group 1A
  9. 16. contains all of the mass of the atom
  10. 18. subatomic particle with no charge
  11. 19. tells you the number of atoms of an element in a molecule
  12. 21. areas in the electron cloud where electrons are found
  13. 22. found in the outermost energy level
Down
  1. 1. the moleculs before a chemical reaction
  2. 3. tells you the number of molecules in a chemical formula
  3. 5. a notation that tells you what a molecule is made of
  4. 6. tells you the number of subgroups in a chemical formula
  5. 7. matter cannot be created or destroyed, only_
  6. 9. an element with 30 protons
  7. 12. all elements with the same number of valence electrons are found here
  8. 17. an element found on the zigzag line in the Periodic table
  9. 20. a horizontal row in the Periodic table