Question

Thallium and indium form $\mathbf{+}\mathbf{1}$ and$\mathbf{+}\mathbf{3}$ oxidation states when in compounds. Predict the formulas of the possible compounds between thallium and oxygen and between indium and chlorine. Name the compounds.

Short answer

Thallium(I) oxide,$Ti{O}_2$and thallium(III) oxide, $T{i}_2{O}_3$.

Indium(I) chloride, $InCl$ and indium(III) chloride, ${\text{InCl}}_3$.

Step-by-step solution

Definition of compound

Any material made up of similar molecules made up of atoms from two or more chemical elements is called a chemical compound.

Determine the formulae of compounds

In a neutral substance, the total of all atoms oxidation numbers equals zero.

The oxidation number of oxygen in oxides is $-2$.

In the thallium(I) oxide, thallium has an oxidation number of $a+1$.

To balance one oxygen ion, two thallium ions are required.

The oxidation number of thallium is $a+3$in thallium(III) oxide.

To balance three oxygen ions, two thallium ions are required.

The oxidation number of chlorine in chlorides is $-1$.

Indium(I) chloride has an oxidation number of $a+1$.

As a result, one indium ion is equal to one chlorine ion.

The oxidation number of indium in indium(III) chloride is $a+3$.

To balance one indium ion, three chlorine ions are required.