Oxidation Numbers

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Across
  1. 2. For an ion, the ___ of the oxidation numbers of all the atoms in the formula for the ion is equal to the charge on the ion
  2. 4. the oxidation number of a ______ ion is simply the charge on that ion.
  3. 7. oxidation refers to reactions in which an atom or group of atoms gains ______
  4. 9. results in a DECREASE in oxidation number.
  5. 11. The oxidation number of a free, uncombined element is _____.
  6. 12. NUMBER Chemists use a bookkeeping device called the __________ to decide what is being oxidized and reduced.
  7. 13. Hydrogen is always +1, except in _________, where it's -1
Down
  1. 1. For a _____ compound, the sum of the oxidation numbers of all the atoms in the compound's formula is zero.
  2. 3. The OXIDATION NUMBERS determine the relative electron "_______" on atoms
  3. 5. The OXIDATION NUMBERS enable us to decide whether the chemical formula assigned to a ______ is valid or not
  4. 6. Certain atoms almost always have the same oxidation number in all __________
  5. 8. Oxygen is always -2, except in ________, where it's -1
  6. 10. REACTIONS The OXIDATION NUMBERS helps us to balance ____________