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Boron has a small size and high electronegativity. Due to this, B(OH)3 can donate a proton (H+) and act as a Brønsted acid. Aluminium has an intermediate size and electronegativity. Al(OH)3 can behave both as an acid by donating H+ and as a base by accepting H+. Hence it is amphoteric. Thallium has a large size and low electronegativity. Tl(OH)3 can accept a proton (H+) and act as a Brønsted base. The electropositive or metallic character of group 13 elements increases from B to Tl. B being a non-metal

Author

Ayanavo Das

Language

EN