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Thalium (Tl) exhibits monovalency wherea...

Thalium `(Tl)` exhibits monovalency whereas `Al` exhibits trivalency.
This is due to :

A

The energy required to unpair outer s-electrons in `Tl` exceeds the enery involved in bond formation.

B

`Tl` has only one electron in its outermost orbital.

C

`Al` can use its vacant d-orbitals for the bond formation.

D

`Tl` is a non-metal.

Text Solution

Verified by Experts

The correct Answer is:
option 1
Due to inert pair effect.
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