Each of the ions in the table form stable oxides (\(\ce{Na2O}\), \(\ce{CdO}\), and \(\ce{La2O3}\)). Lanthanum oxide, La2O3 , has a melting point significantlyhigher than that of the other oxides. Which of the following is the best explanation of why this is true?

Lanthanum is a lanthanide element, and the melting points of these elements are always high.

There is more oxygen in the formula \(\ce{La2O3}\) than in the other formulas.

Lanthanum had the highest charge; therefore, it has the highest lattice energy.

Alkali metals like sodium and transition metals like cadmium tend to have low melting points.

Chemistry

College Board

Exam No：AP Chemistry Problem Set 6 Year：2024 Question No：APChemistry2024AP0232

Answer:

9.3 Gibbs Free Energy and Thermodynamic Favorability

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