Mercury is a liquid metal because

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(C) The electronic configuration of mercury ($Hg$,$Z=80$) is $[Xe] 4f^{14} 5d^{10} 6s^{2}$.Since the $5d$ subshell is completely filled,the electrons

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it has a completely filled orbital that prevents $d-d$ overlapping of orbitals

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(C) The electronic configuration of mercury ($Hg$,$Z=80$) is $[Xe] 4f^{14} 5d^{10} 6s^{2}$.Since the $5d$ subshell is completely filled,the electrons are held tightly by the nucleus and do not participate in metallic bonding through $d-d$ overlapping.This weak metallic bonding results in a low melting point,making mercury a liquid at room temperature.

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