First slide

13th group or boron group

Question

Al is usually found in +3 oxidation state. In contrast thallium exhibit +1 and +3 oxidation states this is due to

Moderate

A

Lattice effect
B

Lanthanide contraction
C

Inert pair effect
D

Diagonal relationship

Solution

Inert pair effect and stability of Tl+1 ion.

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