Write a short note on the anomalous behaviour of boron in the group - 13.

Explanation

`to` Among Group - 13 elements .B. is only the non metal.
`to` .B. forms only covalents compounds.
`to` .B. doesnot displaces hydrogen from acids.
`to` .B.,shows diagonal relationship with, .Si.
`to` .B. forms acidic oxide where as other elements of group forms amphoteric oxides and basic oxides.
`to` .B. has only two electrons in the penultimate shell.
`to` .B. has covalency .4. where as other elements has covalency of maximum .6..