   Chapter 20, Problem 26E

Chapter
Section
Textbook Problem

# Thallium and indium form + 1 and + 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.

Interpretation Introduction

Interpretation: The oxidation states of thallium and indium is given. The formula and name of the possible compounds formed between thallium and oxygen and between indium and chlorine is to be stated.

Concept introduction: Thallium and indium are group 3A elements and exhibits +1 and +3 oxidation state.

Rules for binary compound,

• In the naming of binary compound, the name of cation comes first which is the name of element. Anion is named second which is also the name of element. Anions are named with the ending -ide.
• If the cation exhibits more than one oxidation state, the Roman numeral is used to show the charge on cation.

To determine: The formula and the name of the possible compounds formed between thallium and oxygen and between indium and chlorine.

Explanation

Explanation

For +1 oxidation states thallium (Tl) ,

The general formula of the compound formed between thallium (Tl) and oxygen (O) is,

TlxOy

Where,

• x is the charge on oxygen atom.
• y is the charge on thallium atom.

The charge on thallium is +1 , whereas the charge on oxygen is 2 . Hence, the formula of the compound obtained is,

Tl2O

The name of Tl2O compound is thallium (I) oxide.

Explanation

In the naming of compound, the cation is named first followed by the naming of the anion. The anions are named with the ending -ide. Hence, the name of Tl2O is thallium (I) oxide.

The formula of the compound formed between thallium ( +3 oxidation state) and oxygen is Tl2O3 .

Explanation

For +3 oxidation states thallium (Tl) ,

The general formula of the compound formed between thallium (Tl) and oxygen (O) is,

TlxOy

Where,

• x is the charge on oxygen atom.
• y is the charge on thallium atom.

The charge on thallium is +3 , whereas the charge on oxygen is 2 . Hence, the formula of the compound obtained is,

Tl2O3

The name of Tl2O3 compound is thallium (III) oxide.

Explanation

Rules for binary compound:

• In the naming of binary compound, the name of cation comes first which is the name of element. Anion is named second, which is also the name of element. Anions are named with the ending -ide.
• If the cation exhibits more than one oxidation state, the Roman numeral is used to show the charge on cation.
• Greek prefix is used to express the number of atoms of each element. But the prefix “mono” is not used for cation. When the prefix ends with ‘a’ or ‘o’ and the second element starts with the same vowel ‘a’ or ‘o’ then prefix is not used.

Hence, the name of Tl2O3 is thallium (III) trioxide

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