Tungsten (W) has 6 electron shells. To find an element with the same number of electron shells, we can compare it to the options provided:
- Nickel (Ni) has 4 electron shells.
- Gold (Au) has 6 electron shells.
- Yttrium (Y) has 5 electron shells.
- Molybdenum (Mo) has 5 electron shells.
Therefore, the element with the same number of electron shells as tungsten (W) is gold (Au).