Boron is unable to form `BF_(6)^(3-)`– ion. Explain.

Aluminium forms [AIF_(6)]^(3-) ion but boron does not form [BF_(6)]^(3-) ion. Explain.

Which one of following elements is unable to from MF_(6)^(3-) ion?

Explain the following (a) Gallium has higher ionisation enthalpy than aluminium (b) Boron does not exist as B^(3+) ion (c) Aluminium forms [AlF_(6)]^(3-) ion but boron does not form [BF_(6)]^(3-) ion.