The p-Block Elements

The p-Block Elements

Question

Boron cannot form which one of the following anions?

  • BF63-

  • BH4-

  • B(OH)4-

  • BO2-

Answer

A.

BF63-

because of the non-availability of d-orbitals, boron is unable to expand its octet. Therefore, the maximum covalence of boron cannot exceed 4.

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