My Chemistry Puzzle

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Across
  1. 5. are bound together in a group and carry a characteristic charge.
  2. 8. compounds composed of two elements.
  3. 11. The mass of a water molecule.
  4. 13. can be written given the identities of the compound’s ions.
  5. 18. 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.
  6. 19. is the sum of the average atomic masses of all atoms represented in its formula.
  7. 20. An ionic compound composed of a cation and the anion from an acid.
  8. 21. Ions formed from a single atom.
  9. 22. are identified simply by the element’s name.
  10. 24. showing the smallest whole-number mole ratio of the different atoms in the compound.
  11. 25. usually has an oxidation number of –2.
  12. 26. has an oxidation number of –1 in all its compounds because it is the most electronegative element.
  13. 27. is numerically equal to its formula mass.
  14. 28. consists of the symbols for the elements combined in a compound.
Down
  1. 1. are acids that consist of two elements,usually hydrogen and a halogen.
  2. 2. Shows how the atoms in each ion are bonded together.
  3. 3. are acids that contain hydrogen, oxygen,and a third element (usually a nonmetal).
  4. 4. is usually the compound’s empirical formula for ionic compounds.
  5. 6. indicates the relative number of atoms of each kind in a chemical compound.
  6. 7. To distinguish the ions formed by such elements.
  7. 9. involves combining the names of the compound’s positive and negative ions.
  8. 10. is often useful to know the percentage by mass of a particular element in a chemical compound.
  9. 12. 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.
  10. 14. polyatomic ions that contain oxygen.
  11. 15. is a certain type of molecular compound.
  12. 16. the total numbers of positive charges and negative charges must be equal.
  13. 17. can be assigned to atoms in order to keep track of electron. distributions in molecular as well as ionic compounds.
  14. 23. is the actual formula of a molecular compound.