A mole of Au (gold) atoms would have a higher mass than a mole of K (potassium) atoms.

Here's why:

* Molar Mass: The molar mass of an element is the mass of one mole of its atoms. It's expressed in grams per mole (g/mol).

* Gold (Au): The molar mass of gold is approximately 197 g/mol.

* Potassium (K): The molar mass of potassium is approximately 39 g/mol.

Since gold has a much larger molar mass than potassium, a mole of gold atoms will weigh significantly more than a mole of potassium atoms.