A mixture called a solution, I think.
The atomic mass of an element on the periodic table is the weight of 1 mole of atoms. For example, the atomic mass of Fe is 55.8 on the periodic table. If you weigh out 55.8 grams of Fe you will have 1 mole of iron, or 6.02 x 1023 atoms.
Solar Cycle 25 is now underway and expected to peak with 115 sunspots in July 2025.