Tungsten (W) has an atomic number of 74 and is located in period 6 of the periodic table, indicating it has 6 electron shells. To find an element with the same number of electron shells, we need to look for elements in the same period (period 6).
Out of the provided options:
- Molybdenum (Mo) is in period 5 (5 electron shells).
- Gold (Au) is in period 6 (6 electron shells).
- Nickel (Ni) is in period 4 (4 electron shells).
- Yttrium (Y) is in period 5 (5 electron shells).
The only element that shares the same number of electron shells (6) as tungsten is gold (Au).