Oxidation_States
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8 Terms
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Uncombined elements
Oxidation state = 0 (e.g., O₂, N₂, Cl₂, Cu, Na, Ag, etc.)
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H
+1 in most compounds (e.g., HCl, NaOH, H₂O); −1 in metal hydrides (e.g., NaH)
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Group 1
+1 (e.g., NaCl, KCl, NaBr)
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Group 2
+2 (e.g., CaBr₂, MgBr₂, CaI₂)
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Group 3
+3 (e.g., BF₃, AlCl₃)
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O
−2 (e.g., Na₂O, H₂O); −1 in peroxides (e.g., H₂O₂)
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F
−1 (e.g., NaF, KF, CaF₂)
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Cl
−1 (e.g., NaCl, CaCl₂); positive in some compounds
Note 
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