Question

Explain anomalous property of boron.

Answer 1

1)Boron being small is harder than the other elements of its group.

2)It has higher melting and boiling point than those of the other members of its group.

3) Boron forms only covalent compounds while all other members form both ionic and covalent compounds.

Answer 2

Welcome student,

Gr. 13 of modern periodic table consists of B, Al, Ga, In, Ti & Nh.

◆ Anomalous behaviour of boron -

• Boron has very small atomic size & high electronegativity as compared with other gr. 13 elements.
• Boron involves in covalent bonding while other gr. 13 elements form ionic bonds.
• Boron has vacant d-orbitals with max covalence 4.
• Boron trifluoride is a lewis base while other gr. 13 trifluorides are lewis acids.
• Melting & boiling points of boron are much higher than that of other gr. 13 elements.
• Boron is the only element of gr. 13 that shows allotropy.

Hope this satisfied you.