Question

complete the following table:
some polyatomic ions
name chemical formula
ammonium cation
iodate anion
cyanide anion
so₄²⁻

Explanation:

Step1: Recall the formula for ammonium cation

Ammonium cation is composed of one nitrogen atom and four hydrogen atoms with a +1 charge. So the formula is $\ce{NH4+}$.

Step2: Recall the formula for iodate anion

Iodate anion has one iodine atom and three oxygen atoms with a -1 charge. The formula is $\ce{IO3-}$.

Step3: Recall the formula for cyanide anion

Cyanide anion has one carbon atom and one nitrogen atom with a -1 charge. The formula is $\ce{CN-}$.

Step4: Recall the name for $\ce{SO4^{2-}}$

$\ce{SO4^{2-}}$ is the sulfate anion.

Answer:

name	chemical formula
iodate anion	$\ce{IO3-}$
cyanide anion	$\ce{CN-}$
sulfate anion	$\ce{SO4^{2-}}$