Chapter 4 - Section 4.4 - Atomic Number and Mass Number - Study Check 4.6 - Page 109: c

The element is gold, and its symbol is: "Au".

Looking at the periodic table on page 100, we can see that the element with atomic number equal to 79 has "Au" as its symbol. Searching for "Au" on the table 4.2 (Page 97), we can see that this is the symbol for the element: Gold.