In the US sulf(o)-
Sulphur.
Latin sulfur, sulphur.
Sulphurous acid forms sulphites, while sulphuric acid forms sulphates. Sulphonic acid is an organic acid containing the group -SO2OH, which forms sulphonates; the process of conversion of compounds into sulphonates is sulphonation. Sulphides are compounds of sulphur with another component, usually a metallic element. See also thio‑.
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