A) it has a completely filled s orbital
B) it has a small atomic size
C) it has a completely filled d orbital that prevents d-d overlapping of orbitals
D) it has a completely filled d orbital that causes d-d overlapping
Correct Answer: C
Solution :
The electronic configuration of mercury (80) is, \[[X]\,\,4{{f}^{10}},5{{d}^{10}},6{{s}^{2}}\]. Its d-subshell is completely filled, thus it prevents the overlapping of d orbitals (d-d overlapping). Hence, it is liquid metal at room temperature.
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