Which of the halide ions (F$^-$, Cl$^-$, Br$^-$, and I$^-)$ is the most stable base? Which is the least stable base?
Rank from most stable to least stable. To rank items as equivalent, overlap them.
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Most stable
F$^-$ Cl$^-$ Br$^-$ I$^-$
The correct ranking cannot be determined.
Least stable