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Explanation: There is such a word as "protoned" in chemistry (look up Yahoo or Google and you'll see it being used in some scientific contexts). It's related to "proton". "Composé" is definitely compound.
Rowan Morrell New Zealand Local time: 08:00 Native speaker of: English
Explanation: Protonated is used in the chemical context. Gives about a 1000 times as many hits as protoned. The few instances of protoned are either typos or may refer to cases where the substance is provided with a proton other than by some specific known process (protonation).
Possible phrase translation - an organic radical that can exist in the form of the ion Y - or form the corresponding protonated compound HY.
Lars Finsen Local time: 22:00 Works in field Native speaker of: Norwegian