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12 Cards in this Set
- Front
- Back
The oxidation number of a free element
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is always 0.
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The sum of the oxidation numbers of all of the atoms in a neutral compound is
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0.
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The oxidation number of a monatomic ion equals
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the charge of the ion.
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For example, the oxidation number of Na+ is -- the oxidation number of N3- is --.
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1, -3
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rules concerning H
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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. |
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The oxidation number of oxygen in compounds is usually -- what are the exceptions?
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-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-.
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The oxidation number of a Group IA element in a compound is
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+1
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The oxidation number of a Group IIA element in a compound is
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+2
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The oxidation number of a Group VIIA element in a compound is --, except when that element is ....
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-1, combined with one having a higher electronegativity.
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The oxidation number of Cl is
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-1 in HCl, but the oxidation number of Cl is +1 in HOCl.
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oxidation numbers is 0.
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neutral compound
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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.
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