Ions. Cation: A positive ionMg2 , NH4 Anion: A negative ionCl-, SO42-Ionic Bonding: Force of attraction between oppositely charged ions.. Predicting Ionic Charges. Group 1:. . Lose 1 electron to form 1 ions. H . Li . Na . K . . Predicting Ionic Charges. Group 2:. . Loses 2 electrons to form 2 ions.
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