The atomic mass of an element represents the average mass of an atom of that element, taking into account the relative abundances of its isotopes. Here are the atomic masses of magnesium (Mg), potassium (K), and carbon (C):
Magnesium (Mg): The atomic mass of magnesium is approximately 24.305 atomic mass units (amu).
Potassium (K): The atomic mass of potassium is approximately 39.0983 amu.
Carbon (C): The atomic mass of carbon is approximately 12.0107 amu.
Please note that these values are approximate and may vary slightly depending on the atomic mass scale used.