* Elemental State: Mercury exists as a pure element, meaning it's composed of individual mercury atoms.

* Metallic Bonding: Mercury is a metal and exhibits metallic bonding. In metallic bonding, electrons are delocalized and shared across the entire structure, rather than being localized between specific atoms. This delocalization leads to a uniform distribution of charge.

* Lack of Dipole Moment: Since there's no localized charge difference within the mercury atom, it doesn't have a permanent dipole moment.

In summary, mercury is non-polar because its metallic bonding results in a uniform distribution of charge, making it lack a dipole moment.