Potassium, magnesium, and calcium are essential dietary minerals critical for human physiology. Potassium regulates fluid balance and nerve signals, magnesium supports enzymatic reactions and muscle function, and calcium is vital for bone health and cellular signaling. These are not a single chemical compound but separate elements typically obtained from food sources in ionic forms such as K+, Mg2+, and Ca2+. They do not have unified chemical structures, boiling points, or solubilities as a group.