Final answer:
The noble gas notation for mercury (Hg) is [Xe]4f¹⁴ 5d⁺ 6s²; this shorthand electron configuration starts with the noble gas xenon (Xe) and includes the remaining electrons beyond xenon's configuration.
Step-by-step explanation:
The noble gas notation for the element mercury (Hg) is a way of representing its electron configuration using the electron configuration of the closest noble gas that precedes it in the periodic table, followed by the electrons that are in excess of this noble gas configuration.
The closest noble gas to mercury is xenon (Xe), which has atomic number 54. From this noble gas, we add the remaining electronic configuration of mercury, which has the atomic number 80.
The full electron configuration of mercury is [Xe]4f¹⁴ 5d⁺ 6s², and this is also the noble gas notation for mercury.