Aluminium forms AlF_(6)^(3-)but borondoes not form BF_(6)^(3-).Why so

1.	Aluminium forms AlF_(6)^(3-)but borondoes not form BF_(6)^(3-).Why so ?
Answer» Solution :Al, on the OTHERHAND,DUE to the persence ofd-orbitals canexlendits valency UPTO a maximum of 6 andforms `AlF_(6)^(3-)`.

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