* Noble gases are in Group 18 of the periodic table (also known as Group VIIIA). They are known for being unreactive.

* Neutrons are part of an atom's nucleus, along with protons. The number of neutrons can vary within an element, creating isotopes.

To find the element, we need to consider the number of protons (atomic number):

1. Identify possible noble gases: The noble gases are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).

2. Find the atomic number: Look up the atomic number of each noble gas. This is the number of protons in the atom.

3. Calculate the number of neutrons: Subtract the atomic number from the mass number to get the number of neutrons.

Example:

* Argon (Ar) has an atomic number of 18.

* If we have an Argon isotope with 22 neutrons, its mass number would be 18 (protons) + 22 (neutrons) = 40.

Therefore, the noble gas with 22 neutrons is Argon-40 (⁴⁰Ar).