Practice question
Question
Which ion among the following isoelectronic species with 36 electrons has the highest lattice energy when paired with F⁻?
Explanation
For isoelectronic species (36 electrons), lattice energy increases with charge. Sc³⁺ (Z=21, +3) forms ScF₃ with the highest lattice energy compared to K+, Ca²⁺, or Br⁻.
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