In physiology, the primary ions of electrolytes are sodium (Na+),
potassium (K+), calcium (Ca2+), magnesium (Mg2+),
chloride (Cl−), hydrogen phosphate (HPO42−), and hydrogen carbonate (HCO3−). The electric charge symbols of plus (+) and minus (−) indicate that the substance in question is ionic in nature and has an imbalanced distribution of electrons, the result of chemical dissociation".