Final answer:
The fluoride of strontium (SrF2) should have the greatest lattice energy.
The correct answer is option B) strontium.
Step-by-step explanation:
The lattice energy is a measure of the strength of the bonds in an ionic compound and is influenced by the charges of the ions and the distances between them. Generally, smaller ions and higher charges lead to higher lattice energies. In this case, the fluoride of the metal with the highest charge and the smallest ionic radius should have the greatest lattice energy.
Out of the given options, B. strontium has the highest charge (+2) and smaller ionic radius compared to the others. Therefore, the fluoride of strontium (SrF2) should have the greatest lattice energy.