Question
Transition elements form binary compounds with halogens. Which of the following elements will form $MF_3$ type compounds?
✓
Answer
$Cr$ and $Co$ form $MF_3$ type of compounds. The ability of fluorine to stabilize the highest oxidation state is due to higher lattice energy in $CoF_3$ and higher bond enthalpy for the higher covalent compound like $CrF_6.$
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