Here's why:

* Molar Mass: The molar mass of neon (Ne) is 20.18 g/mol. This means that one mole of neon atoms weighs 20.18 grams.

* Calculation: To find the mass of 0.100 mole of neon, you can use the following equation:

Mass = (Number of moles) * (Molar mass)

Mass = (0.100 mol) * (20.18 g/mol) = 2.018 grams