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12 Cards in this Set

  • Front
  • Back
The oxidation number of a free element
is always 0.
The sum of the oxidation numbers of all of the atoms in a neutral compound is
0.
The oxidation number of a monatomic ion equals
the charge of the ion.
For example, the oxidation number of Na+ is -- the oxidation number of N3- is --.
1, -3
rules concerning H
The usual oxidation number of hydrogen is +1.
The oxidation number of hydrogen is -1 in compounds containing elements that are less electronegative than hydrogen, as in CaH2.
The oxidation number of oxygen in compounds is usually -- what are the exceptions?
-2. Exceptions include OF2, since F is more electronegative than O, and BaO2, due to the structure of the peroxide ion, which is [O-O]2-.
The oxidation number of a Group IA element in a compound is
+1
The oxidation number of a Group IIA element in a compound is
+2
The oxidation number of a Group VIIA element in a compound is --, except when that element is ....
-1, combined with one having a higher electronegativity.
The oxidation number of Cl is
-1 in HCl, but the oxidation number of Cl is +1 in HOCl.
oxidation numbers is 0.
neutral compound
The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.
For example, the sum of the oxidation numbers for SO42- is -2.
For example, the sum of the oxidation numbers for SO42- is -2.