Tungsten (W) has an atomic number of 74 and is located in period 6 of the periodic table. It has 6 electron shells.
To find an element with the same number of electron shells, we should look for elements in period 6 as well. Among the options provided:
- Yttrium (Y) 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).
- Molybdenum (Mo) is in period 5 (5 electron shells).
Thus, the element that has the same number of electron shells as tungsten (W) is gold (Au).
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