Explanations:

The atomic mass of sodium is 22.99 g/mol. This means that 8 grams of sodium is equal to 8 / 22.99 = 0.348 moles of sodium. Each mole of sodium contains 6.022 * 10^23 atoms, so 0.348 moles of sodium contains 0.348 * 6.022 * 10^23 = 2.10 * 10^23 atoms.

Therefore, 8 grams of sodium will contain 2.10 * 10^23 atoms.