A mole of K (potassium) and a mole of Au (gold) would contain the same number of atoms.

Here's why:

* Avogadro's Number: A mole is a unit of measurement that represents a specific number of particles, specifically 6.022 x 10^23 particles. This is known as Avogadro's number.

* Equal Moles, Equal Atoms: A mole of any substance always contains the same number of particles (atoms, molecules, etc.).

Therefore, whether it's potassium or gold, a mole of either will contain 6.022 x 10^23 atoms.