That would be the bichromate or sometimes called the dichromate ion. Example: Sodium bichromate (or sodium dichromate) is Na2Cr2O7.
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The usual name is "dichromate", but I think the systematic name is closer to "heptoxidodichromate(VI)".
For ionic compounds such as the one mentioned above, naming them is relatively easy. As we all know, an ionic compound consists of a metal ion(which is usually positive) and a negative ion. Hence, the names for metallic compounds are always in the following format: Name of metal + Name of negative ion However, do take note that for transition metals, the oxidation state has to be included. This is because transition metals have multiple oxidation states. The oxidation state of the metal is presented by: Metal (oxidation number). For example, rust is Iron (III) oxide. Cr2O3 is hence named chromium (III) oxide.
The name of the ionic compound AlP is aluminum phosphide.
The name for the binary ionic compound CdO is cadmium oxide.
The ionic compound name of NaClO4 is sodium perchlorate.
The name of the ionic compound CrPO4 is chromium(III) phosphate.