Lattice energy Transitional Reasoning Practice

Questions

1. 1.

   A materials chemist synthesizes four crystalline ionic solids—W, X, Y, and Z—consisting of divalent or monovalent ions to identify which compound will exhibit the highest thermal stability based on its lattice energy. Compound W consists of $\text{Na}^+$ and $\text{Cl}^-$, compound X consists of $\text{Mg}^{2+}$ and $\text{O}^{2-}$, compound Y consists of $\text{Ca}^{2+}$ and $\text{O}^{2-}$, and compound Z consists of $\text{K}^+$ and $\text{Br}^-$. Based on Coulombic principles governing lattice energy, which statement correctly ranks the compounds or identifies the solid with the greatest lattice energy?

   • A) Compound Z has the greatest lattice energy because its larger ionic radii allow the ions to pack with the maximum coordination number.
   • B) Compound W has a greater lattice energy than compound Y because monovalent ions exhibit less electron-electron repulsion in the crystal lattice.
   • C) Compound Y has a greater lattice energy than compound X because $\text{Ca}^{2+}$ possesses a larger nuclear charge that pulls $\text{O}^{2-}$ ions closer.
   • D) Compound X has the greatest lattice energy because its constituent ions carry higher charges and have smaller ionic radii than those in compound Y.

Answers and step-by-step solutions appear after you finish the test.