To you can solve your question, you need the following data:
Each gold atom has 79 electrons
0.990 Oz = 28.066 g
Au atomic weight: 197g/mol
1 mol = 6.022 atoms
1 mol -----> 197 g
X mol -----> 28.066 g = 0.14 mol
1 mol ------> 6.022 atoms
0.14 mol --> X = 0.86 atoms
1 gold atom --------> 79 electrons
0.86 gold atoms --> X = 67.78 electrons
Then, 0.990 oz of pure gold have 67.78 electrons
