Answer: The symbol of Mercury(I) nitrate:

Step-by-step explanation:
- Symbol of the mercury metal is Hg.
- The symbol of nitrate ion is
.
The chemical formula of Mercury(I) nitrate:

It is formed by the combination of mercury ion and nitrate ion. Nitrate ion is a polyatomic ion.
The reaction for the combination of the ions to form mercury (I) nitrate follows the equation:
