Problem: What are the charges on the copper and phosphide ions, respectively, in copper(II) phosphide?

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We’re being asked to determine the charges on the copper and phosphide ions, respectively, in copper(II) phosphide.


The rules for naming binary ionic compounds are as follows:

1. The metal keeps its name and is named and written first.

– For transition metals, we use Roman numerals to denote its charge.


2. The nonmetal keeps its base name but has its ending changed to –ide.


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What are the charges on the copper and phosphide ions, respectively, in copper(II) phosphide?

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