My Chemistry Puzzle

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Across
  1. 3. are acids that contain hydrogen, oxygen, and a third element (usually a nonmetal).
  2. 7. An ionic compound composed of a cation and the anion from an acid
  3. 8. usually has an oxidation number of –2.
  4. 9. compounds composed of two elements
  5. 10. is numerically equal to its formula mass.
  6. 14. polyatomic ions that contain oxygen.
  7. 16. has an oxidation number of –1 in all its compounds because it is the most electronegative element.
  8. 19. is numerically equal to its molar mass, so a compound’s molecular formula can also be found given the compound’s empirical formula and its molar mass.
  9. 20. Shows how the atoms in each ion are bonded together.
Down
  1. 1. The mass of a water molecule
  2. 2. To distinguish the ions formed by such elements.
  3. 4. is the sum of the average atomic masses of all atoms represented in its formula.
  4. 5. consists of the symbols for the elements combined in a compound, with subscripts showing the smallest whole-number mole ratio of the different atoms in the compound.
  5. 6. is usually the compound’s empirical formula for ionic compounds.
  6. 11. involves combining the names of the compound’s positive and negative ions.
  7. 12. are acids that consist of two elements, usually hydrogen and a halogen.
  8. 13. can be assigned to atoms in order to keep track of electron distributions in molecular as well as ionic compounds.
  9. 15. Are bound together in a group and carry a characteristic charge.
  10. 17. has an oxidation number of +1 in all compounds containing elements that are more electronegative than it but has an oxidation number of –1 with metals.
  11. 18. is a certain type of molecular compound.