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Oxidation number

Bob Jones PPT Notes -- Chapter 8a

Subject: 
Chemistry
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Chemistry
Chemical reactions
Coordination chemistry
Physical chemistry
redox
Soil chemistry
Oxidation number
Polyatomic ion
ion
Chemical bond
Fluorine
Oxide

Chemical Composition &Reactions Oxidation Numbers Keep track of electrons during bonding Tell how many electrons are involved in the bond Tell whether electrons are gained, lost, or unequally shared Oxidation Numbers Help in predicting formulas The more electronegative element gains electrons. The oxidation number of atoms and elements is zero. (free-element) Rule 1 Oxidation Numbers Examples: He ? no bonds O2 ? equal sharing (free-element) Rule 1 Oxidation Numbers The oxidation number of a monatomic ion is equal to the charge of the ion. (ions) Rule 2 Oxidation Numbers Example: Mg loses two electrons, so its charge is +2; therefore, its oxidation number is also +2. (ions) Rule 2 Oxidation Numbers Example: Cl gains one electron, so its charge and oxidation number are ?1. (ions)
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