Question

which chemical symbols will complete the equation for this decomposition reaction?
$2ki \
ightarrow 2\square + \square_2$

Explanation:

Step1: Identify reactant components

Reactant is $2\text{KI}$, containing $\text{K}^+$ and $\text{I}^-$ ions.

Step2: Apply decomposition rules

Decomposition of $\text{KI}$ produces elemental potassium and iodine. Iodine forms diatomic molecules.

Step3: Balance the equation

For 2 $\text{KI}$: 2 $\text{K}$ atoms and 1 $\text{I}_2$ molecule balance the atoms.
$2\text{KI}
ightarrow 2\text{K} + \text{I}_2$

Answer:

First blank: $\text{K}$, Second blank: $\text{I}$