This flowchart will tell you whether you need to use prefixes, Roman Numerals, or neither when you're naming compounds in Chemistry.
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Polyatomic!
(prefix: Y
RN's: maybe)
| YES
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Are there more than two different elements?
| NO
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Do you have any metals?
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YES
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NO
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Do you have a transition metal?
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Covalent!
(prefix: Y
RN's: N)
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YES
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NO
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Binary Ionic w/ Transition Metal!
(prefix: N
RN's: Y)
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Binary Ionic!
(prefix: N
RN's: N)
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