Question

fill in the name and empirical formula of each ionic compound that could be formed from the ions in this

some ionic compounds

cation	anion	empirical formula	name of compound
mn³⁺	no₂⁻
fe²⁺	cro₄²⁻

Explanation:

Step1: Determine formula for $Ca^{2 +}$ and $MnO_{4}^{-}$

To balance charges, we need 2 $MnO_{4}^{-}$ for 1 $Ca^{2+}$. The empirical formula is $Ca(MnO_{4})_{2}$. The name is calcium permanganate.

Step2: Determine formula for $Mn^{3+}$ and $NO_{2}^{-}$

To balance charges, we need 3 $NO_{2}^{-}$ for 1 $Mn^{3+}$. The empirical formula is $Mn(NO_{2})_{3}$. The name is manganese(III) nitrite.

Step3: Determine formula for $Fe^{2+}$ and $CrO_{4}^{2 -}$

The charges are already balanced with a 1:1 ratio. The empirical formula is $FeCrO_{4}$. The name is iron(II) chromate.

Answer:

cation	anion	empirical formula	name of compound
$Mn^{3+}$	$NO_{2}^{-}$	$Mn(NO_{2})_{3}$	manganese(III) nitrite
$Fe^{2+}$	$CrO_{4}^{2 -}$	$FeCrO_{4}$	iron(II) chromate