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Q. Transition elements form binary compounds with halogens. Which of the following elements will form $MF_3$ type compounds?

The d-and f-Block Elements

Solution:

$Cu \rightarrow Cu ^{+}, Cu ^{2+} \rightarrow CuCl , CuF _{2}$
generally transition metals form binary compounds with halogens but $Cr$ form $CrF _{3}$
$\Rightarrow MF _{3}$ type compound