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
na⁺ | no₂⁻ | |
k⁺ | bro₃⁻ | |
na⁺ | io₃⁻ | |

Explanation:

Step1: For the first row (cation $\ce{Na+}$, anion $\ce{NO2-}$)

To form a neutral ionic compound, the charges must balance. $\ce{Na+}$ has a +1 charge and $\ce{NO2-}$ has a -1 charge. So the empirical formula is $\ce{NaNO2}$. The name is sodium nitrite (since $\ce{NO2-}$ is the nitrite ion).

Step2: For the second row (cation $\ce{K+}$, anion $\ce{BrO3-}$)

$\ce{K+}$ has a +1 charge and $\ce{BrO3-}$ has a -1 charge. The empirical formula is $\ce{KBrO3}$. The name is potassium bromate (as $\ce{BrO3-}$ is the bromate ion).

Step3: For the third row (cation $\ce{Na+}$, anion $\ce{IO3-}$)

$\ce{Na+}$ has a +1 charge and $\ce{IO3-}$ has a -1 charge. The empirical formula is $\ce{NaIO3}$. The name is sodium iodate (since $\ce{IO3-}$ is the iodate ion).

Answer:

cation	anion	empirical formula	name of compound
$\ce{K+}$	$\ce{BrO3-}$	$\ce{KBrO3}$	potassium bromate
$\ce{Na+}$	$\ce{IO3-}$	$\ce{NaIO3}$	sodium iodate