Understanding the Concept

* Moles and Atoms: The number of atoms in a substance is directly proportional to the number of moles. One mole of any substance contains Avogadro's number of particles (6.022 x 10^23).

* Molar Mass: The molar mass of an element is the mass of one mole of that element.

Calculations

1. Molar Mass:

* Helium (He): 4.00 g/mol

* Neon (Ne): 20.18 g/mol

2. Moles in 1 gram:

* Helium: (1 g) / (4.00 g/mol) = 0.25 mol

* Neon: (1 g) / (20.18 g/mol) = 0.049 mol

3. Number of Atoms:

* Helium: (0.25 mol) * (6.022 x 10^23 atoms/mol) = 1.51 x 10^23 atoms

* Neon: (0.049 mol) * (6.022 x 10^23 atoms/mol) = 2.95 x 10^22 atoms

Conclusion

One gram of helium contains a greater number of atoms than one gram of neon.