Thallium shows different oxidation states because:
A
it is a transition metal
B
of inert pair effect
C
of its amphoteric character
D
of its high reactivity
Text Solution
Verified by Experts
The correct Answer is:
B
Inert pair effect is the phenomenon in which outer shell `(ns^2)` electrons penetrate to (n-1) delectrons and thus, becomes closer to nucleus and are more effectively pulled towards nucleus. This results in less availability of ns electrons for bonding. The inert pair effect begins when `n ge 4` and increases with increasing value of n.
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