Question

The compounds AICI₃, CrCL₃, and ICI₃ have similar formulas, yet each follows a different set ofrules to name it. Name these compounds, and then compare and contrast the nomenclature rules used in each case.

Short answer

The rules for naming these ionic compounds (AlCl₃, CrCl₃) are used due to the formation of more stable bonds by Cr. The rule for naming this compound (ICl₃) is only non-metals.

Step-by-step solution

Rules for naming non-metal compounds

The rules for non-metal compounds includes:

1. First name should be named first
2. There is an usage of full element name
3. Second element should be named anion and in prefix can be used for atom number present in the compound

Rules for naming ionic compounds

The rules for ionic compounds includes:

1. The cation should be named first
2. Cation name should be similar to element name
3. Cation charge can be denoted by roman numeral using parentheses
4. Anion naming should take first part and add suffix or as polyatomic ion

Aluminium chloride as AlCl₃

Chromium (III) chloride as CrCl₃

Iodine tri-chloride as ICl₃

Naming of each compounds

The rules for naming these ionic compounds (AlCl₃, CrCl₃) are used due to the formation of more stable bonds by Cr. The rule for naming this compound (ICl₃) is only non-metals.

Aluminium chloride as AlCl₃

Chromium (III) chloride as CrCl₃

Iodine tri-chloride as ICl₃