What is mercury and neon combined?

Answer 1

There is no compound of Mercury and neon. Although mercury forms compounds with most other elements, neon doesn't form neutral compounds with anything (although some exotic ions such as (NeH)+ exist).

Answer 2

The combination of mercury and neon would be a mixture of the two elements. Mercury is a liquid metal, while neon is a noble gas. The resulting mixture would likely have properties that reflect a combination of both elements.