Question

fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table:
some ionic compounds
cation anion empirical formula name of compound
$co^{2 + }$ $no_{3}^{-}$
$cr^{2 + }$ $bro_{3}^{-}$
$zn^{2 + }$ $so_{3}^{2 - }$

Explanation:

Step1: Determine formula for $Co^{2 +}$ and $NO_3^{-}$

To balance the charges, we need 2 nitrate ions for 1 cobalt - (II) ion. The empirical formula is $Co(NO_3)_2$. The name of the compound is cobalt(II) nitrate.

Step2: Determine formula for $Cr^{2+}$ and $BrO_3^{-}$

To balance the charges, we need 2 bromate ions for 1 chromium - (II) ion. The empirical formula is $Cr(BrO_3)_2$. The name of the compound is chromium(II) bromate.

Step3: Determine formula for $Zn^{2+}$ and $SO_3^{2 -}$

The charges are already balanced with a 1:1 ratio. The empirical formula is $ZnSO_3$. The name of the compound is zinc sulfite.

Answer:

cation	anion	empirical formula	name of compound
$Cr^{2+}$	$BrO_3^{-}$	$Cr(BrO_3)_2$	chromium(II) bromate
$Zn^{2+}$	$SO_3^{2 -}$	$ZnSO_3$	zinc sulfite