![]() ![]() So we see monoxide or pentoxide, rather than monooxide or pentaoxide in molecule names. The only prefix which is used when putting the substituents in. Bilal Pandit 3F wrote: They are used when. They are used if the ligand you are naming already has a name with di-, tri-, tetra-, tetra. In some cases, when a prefix ends in a or o and the element name begins with o, we drop the a or o on the prefix. of times the substituent group occurs is indicated by a prefix (di, tri, tetra, etc.). When are bis-, tris-, tetrakis- used instead of di-, tri-, tetra- They are used when the ligand has a prefix itself, so the ligand would have a di, tri, etc, so instead of saying didi, you would just say dis. tetra- Meaning of prefix tetra- by etymonline Advertisement tetra- before vowels tetr-, word-forming element meaning 'four,' from Greek tetra-, combining form of tettares (Attic), tessares 'the numeral four' (from PIE root kwetwer- 'four'). Different compounds have different names. Its name, if you go through all the steps, is sulfur trioxide. The system of chemical nomenclature is designed to give this compound its own unique name. SO 3 has three oxygen atoms in it, so it is a different compound with different chemical and physical properties. Why all this trouble? There is another common compound consisting of sulfur and oxygen whose molecular formula is SO 3, so the compounds need to be distinguished. Bringing these two words together, we have the unique name for this compound-sulfur dioxide. \)) with the stem ox- and the suffix -ide, to make dioxide.
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