The number of moles in a given amount of atoms can be calculated using Avogadro's number (Nₐ), which represents the number of atoms or molecules present in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23.

Given the number of atoms of Calcium as 1.204 x 10^24, we can determine the number of moles using the formula:

Number of moles (n) = Number of atoms / Avogadro's number (Nₐ)

n = (1.204 x 10^24 atoms) / (6.022 x 10^23 atoms/mol)

n ≈ 2 moles

Therefore, there are approximately 2 moles in 1.204 x 10^24 atoms of Calcium.