Final answer:
The element that forms an X ion containing 0 electrons is Helium.
Step-by-step explanation:
The element that forms an X ion containing 0 electrons is b) Helium.
Helium, which is a noble gas, has an atomic number of 2, meaning it has two protons and two electrons. The first electron has the same quantum numbers as the hydrogen atom electron, and the second electron also goes into the 1s orbital and fills it. Therefore, the helium atom contains 2 electrons and has a net charge of zero.