A) its atomic size
B) its ionization potential
C) inert pair effect
D) diagonal relationship
Correct Answer: C
Solution :
Inert pair effect due to this thallium is found commonly in +1 oxidation state. It has electronic configuration as \[[Xe]4{{f}^{14}}5{{d}^{10}}6{{s}^{2}}6{{p}^{1}}\] and shows oxidation states + 3 and + 1.
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