Answered: The triiodide (I3–), tribromide (Br3–),…

The triiodide (I3–), tribromide (Br3–), and trichloride (Cl3–) anions all exist, but the trifluoride (F3–) anion has not been observed. Why is that?

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter3: Atomic Shells And Classical Models Of Chemical Bonding

Section: Chapter Questions

Problem 86AP

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Concept explainers

Actinides

The elements in which the extra electron tends to enter the 5f-orbitals of (n–2)th main shell are considered 5f-block elements. They are also named actinides. Actinides include 15 elements, from atomic number 89 to 103.

Question

The triiodide (I₃^–), tribromide (Br₃^–), and trichloride (Cl₃^–) anions all exist, but the trifluoride (F₃^–) anion has not been observed. Why is that?

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