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The formation of the oxide ion, O ^2 - (g) , from oxygen atom requires first an exothermic and then an endothermic step as shown below: O(g) + e^-→ O^-(g); Δ H^∘ = -
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Chapter 20. Calculating Oxidation Numbers Each oxide ion has a charge of -2 7 oxide ions have a subtotal charge of -2 x 7 = -14 Since the formula has. - ppt download
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