QUESTION IMAGE
Question
an ionic compound with +1 and -3 ions
cation anion formula name
Step1: Choose ions
Let's take cation as $\ce{Na+}$ (sodium ion, charge +1) and anion as $\ce{N^{3-}}$ (nitride ion, charge -3).
Step2: Balance charges
To balance the charges, we need 3 $\ce{Na+}$ ions (total positive charge $3\times(+1) = +3$) and 1 $\ce{N^{3-}}$ ion (total negative charge $-3$) so that the overall charge is zero.
Step3: Write formula
The formula is $\ce{Na3N}$.
Step4: Name the compound
The cation is sodium, the anion is nitride, so the name is sodium nitride.
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(Note: Other examples are also possible, e.g., cation $\ce{K+}$, anion $\ce{P^{3-}}$, formula $\ce{K3P}$, name potassium phosphide, etc.)