A) \[s-block\]
B) \[p-block\]
C) \[d-block\]
D) \[f-block\]
Correct Answer: B
Solution :
The electronic configuration of the atom with atomic number 81 is \[=[Xe]4{{f}^{14}},\,\,5{{d}^{10}},\,\,6{{s}^{2}}{{p}^{1}}\] Electronic configuration shows that \[p\] orbitals of the element are incomplete, hence it belongs top block (III A group element, ie,\[Tl\]).
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