Name the following ionic compounds: (f) Cr(NO₃)₃

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Identify the cation and the anion in the compound. The cation is Cr (chromium) and the anion is NO3 (nitrate).

Determine the charge of the anion. The nitrate ion (NO3) has a charge of -1.

Since there are three nitrate ions, the total negative charge is -3.

To balance the charges, the chromium cation must have a charge of +3.

Name the compound by stating the name of the cation followed by the name of the anion. Include the charge of the cation in Roman numerals in parentheses.

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Ionic Compounds

Ionic compounds are formed when atoms transfer electrons, resulting in the formation of positively charged cations and negatively charged anions. These oppositely charged ions attract each other, creating a stable compound. Understanding the nature of ionic bonds is essential for naming and writing formulas for ionic compounds.

Nomenclature of Ionic Compounds

The nomenclature of ionic compounds involves specific rules for naming the cations and anions. Typically, the cation retains its elemental name, while the anion's name is derived from its elemental name, often modified with an '-ide' suffix for simple anions. For transition metals, the oxidation state is indicated using Roman numerals.

Polyatomic Ions

Polyatomic ions are ions composed of two or more atoms covalently bonded together, which carry a net charge. They play a crucial role in ionic compounds, as they can replace simple anions in compound formulas. Recognizing common polyatomic ions, such as nitrate (NO3-) and chromate (CrO4^2-), is vital for correctly naming and writing formulas for ionic compounds.

Name the following ionic compounds: (f) Cr(NO3)3