First slide

Atomic and physical properties

Question

The maximum covalency of aluminium is ‘6’ where as that of boron is ‘4’ because

Easy

A

Aluminium is more electropositive than boron
B

‘Al’ can form a cation where as boron can not
C

‘Al’ contains vacant ‘d’ orbitals in its valence shell where as boron does not
D

‘Al’ is a metal where as boron is a non metal

Solution

Al contains empty d-orbitals in its valency shell that is in third shell,therefore it can extends its valency up to 6.Where as Boron doesnot contain empty d-orbitals in its valency shell and hence it cannot extends its valency to six and its maximum valency is 4,due to presence of 4 valency orbitals i.e.,one ns and three -np orbitals.

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