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Cr → transition metal → multiple possible charges
Ca → Group 2A → +2 charge
Why is CrO named using a Roman numeral, chromium(II) oxide, whereas CaO is named without a Roman numeral, calcium oxide?
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Our data indicates that this problem or a close variation was asked in Chemistry: The Central Science - Brown 13th Edition. You can also practice Chemistry: The Central Science - Brown 13th Edition practice problems.