Binary compound

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A binary compound is a compound that contains two different elements, such as NaCl (salt).

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Metal + Valence of metal (As Roman numerals) + Nonmetal + “-ide”

“Latin Method” Latin name of metal + “-ic” (For higher valence) / “-ous” (For lower valence) + Nonmetal + “-ide” werwere

“Hydro-” + Nonmetal + “-ic” + “acid”

There are only 5 existing non-metals that can be involved in binary acids when combined with hydrogen namely Chlorine, Fluorine, Bromine, Iodine and Sulfur.

Nonmetal + Nonmetal + "-ide"

Add the appropriate Latin prefix to each element name to denote the number of atoms of each element present in a molecule of the compound. This method is not used with ionic compounds(see below), only with covalent compounds. For example, K2O is not dipotassium monoxide, it is simply potassium oxide. P4O6, however, would be tetraphosphorus hexaoxide. Some elements beginning with vowels (Oxygen, for example) replace the vowel ending of its prefix; mono- + Oxide = Monoxide, O4 = Tetraoxide, O5 = Pentaoxide, and so on.

Cation (+ charge) + Anion (- charge) + "ide" (if the anion is only 1 atom-ex.: MgS=Magnesium Sulfide)

If the Anion is more than one atom of the same substance, either "ite" or "ate" is added at the end instead of "ide". "ite" is used when the anion is <3, "ate" if the anion is 3 or higher. Ex.: CaCl2=Calcium Chlorite. Exceptions are common however... one being Iron(III) Oxide=Fe2O3.


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*Exception – If the first element is a single atom, do not write “mono”.
1 Mono- 3 Tri- 5 Penta- 7 Hepta- 9 Nona-
2 Di- 4 Tetra- 6 Hexa- 8 Octa- 10 Deca-
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