Which element of group 13 shows anomalous behaviour?

Answer:

Boron shows anomalous behaviour in group 13 because of its small size and absence of d orbital.

Anomalous properties of boron

Boron is observed to have properties that are in contrast to the other elements of the boron family due to the following reasons:

  • It has a very small size
  • It has a very high ionisation enthalpy
  • It has high electronegativity owing to its small size
  • The absence of d-orbital in the valence shell

Some of these odd characteristics are discussed below.

  • Except for boron, the compounds of the elements of the boron family-like tetrahedral [M(OH)4] and octahedral [M(H2O)6]3+ (where M denotes the member of the boron family) exists in an aqueous medium.
  • The maximum covalence of boron is 4 due to the absence of d orbitals.
  • Boron is a metalloid, while the others are post-transition metals.
  • The oxides and hydroxides of boron are acidic, while the oxides and hydroxides of the other elements in the family are amphoteric.

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