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Answer:

U⁴⁺  

Explanation:

Fluorine stabilizes metals in higher oxidation states with high M:F ratios.

Hard acids prefer to bind to hard bases.

U⁴⁺ is the hardest acid in the list and F⁻ is a hard base, so an eight-coordinate complex of U⁴⁺ is the most stable.

The metal ion that can most adequately exist in the form of 8-coordinate complex would be:

d). U⁴⁺  

  • 'Coordination Complex' is characterized as either an ion or a compound that consists of the main metallic atom that is linked through interrelated bonds employing a fixed number of nearby encircling atoms.
  • In the given question, the metal ion U⁴⁺ would most adequately retain in the form of  8 coordinate complexes because it allows metals to sustain in a greater rate of oxidation having a greater ratio of M:F.
  • Since hard bases are defined by stronger acids, U⁴⁺ would be most appropriate as it is a hard acid while F⁻ is a strong base which makes it reliable.

Thus, option d is the correct answer.

Learn more about 'Fluoride' here:

brainly.com/question/3795082

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