Naming ions and ionic compounds (article) | Khan Academy
https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:ionic-bonds/a/naming-ions-and-ionic-compounds
WEBIn speech, we'd typically refer to it as an "oxygen ion", "oxide", or " O -two-minus" Since we can predict the charge of main group anions by their location on the periodic table, it's usually not necessary to specify their charge in the name. For example, it is implied that an oxide ion has a 2 − charge. We don't need to say "oxide-two-minus".
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