Questions
Thalium (Tl) exhibits monovalency whereas Al exhibits trivalency. This is due to:
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By Expert Faculty of Sri Chaitanya
a
The energy required to unpair outer s-electrons in Tl exceeds the energy 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.
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Correct option is A
Due to inert pair effect.
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