MCQ
Which one of the following elements is unable to form $MF_{6}^{3-}$ ion?
- A$Ga$
- B$Al$
- ✓$B$
- D$In$
✓
Answer
Correct option: C.
$B$
c
$\mathrm{MF}_{6}^{-3}$
$\mathrm{MF}_{6}^{-3}$
Boron belongs to $2^{\text {nd }}$ period and it does not have vacant $d-$orbital.
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