The coordination number for the Al3+ ion is typically between four and six. Use the anion coordination number to determine the Al3 + coordination number in the following compounds: (c) AlN where the nitride ions are four coordinate.

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Identify the coordination number of the nitride ion, which is given as four.

Understand that the coordination number of the cation (Al^{3+}) must balance the coordination number of the anion (N^{3-}) in the compound.

Since the nitride ion (N^{3-}) is four-coordinate, each Al^{3+} ion must also coordinate with four N^{3-} ions to maintain the stoichiometry and charge balance in the compound.

Recognize that the coordination number of Al^{3+} in AlN is determined by the number of nitride ions it is bonded to, which is four in this case.

Conclude that the coordination number of Al^{3+} in AlN is four, matching the coordination number of the nitride ions.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Coordination Number

The coordination number refers to the number of ligand atoms that are bonded to a central metal ion in a complex. It is a crucial concept in coordination chemistry, as it influences the geometry and stability of the complex. For example, a coordination number of four typically leads to a tetrahedral arrangement, while six results in an octahedral geometry.

Ligands

Ligands are ions or molecules that can donate a pair of electrons to a central metal ion, forming coordinate covalent bonds. They play a significant role in determining the properties and reactivity of coordination compounds. In the case of AlN, the nitride ion (N^3-) acts as a ligand, coordinating with the Al3+ ion and influencing its overall coordination number.

Ionic Compounds and Charge Balance

Ionic compounds are formed from the electrostatic attraction between positively charged cations and negatively charged anions. In determining the coordination number of Al3+ in AlN, it is essential to consider the charge balance between the aluminum ion and the nitride ions. The overall charge neutrality of the compound dictates how many nitride ions can coordinate with the aluminum ion.