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  4. Which one of the following elements is unable to form MF3-6 ion ?

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Q. Which one of the following elements is unable to form $MF^{3-}_6$ ion ?

NEETNEET 2018The p-Block Elements

Solution:

$\because 'B' $ has no vacant d-orbitals in its valence shell, so it can't extend its covalency beyond $4$ . i.e. ' $B $ ' cannot form the ion like $MF _{6}{ }^{3(-)}$ i.e. $BF _{6}^{3(-)}$