Biological importance of elements of group 1 and group 2

Group 1: sodium ion is present in the largest supply of all ions in extracellular fluids, which serve as the medium that transports nutrients to the body's cells; the concentration of sodium ion in these extracellular fluids governs how water moves across cell membranes; sodium ions also take part in transmitting nerve signals. Potassium ions, by contrast, are the most abundant ions found inside cells, and are required for the cell to synthesise proteins and oxidise glucose at maximum efficiency. …