Question

Write the chemical formula of the compound iron [III] chloride in a step-by-step manner.

Answer 1

The symbol of iron is ‘Fe’, having a valency of 3⁺.

The symbol of chloride is ‘Cl’ with valency 1^-.

Step 1 –

Write the formula of iron [III] chloride:

Symbol Valency

Iron Fe 3⁺

Chloride Cl 1^-

Step 2 –

Write each symbol with its valency:

Fe³⁺ Cl^1-

Step 3 –

Interchanging the valencies:

$$\begin{gathered} \mathrm{Fe}\mathrm{Cl} \\ \searrow \swarrow \\ {3}^{+}{1}^{-} \end{gathered}$$

The formula of the compound iron [III] chloride would be FeCl₃.