Final answer:
The statement is false; millimoles (mmol) or milliequivalents (mEq) are commonly used to measure electrolyte concentrations, not milligram percent. For low concentrations, parts per million (ppm) or parts per billion (ppb) are used, while molarity is a common unit in chemistry.
Step-by-step explanation:
The statement that milligram percent is the most common unit used to measure electrolyte concentration is false. Instead, electrolyte concentrations in body fluids are typically reported in millimoles (mmol) or milliequivalents (mEq).
The reason for using these units is because electrolyte concentrations in the human body are not high enough to use moles or equivalents.
Also, for very low concentrations, parts per million (ppm) or parts per billion (ppb) might be used. In chemistry, molarity (M) is indeed a very common unit of concentration, and it is defined as the number of moles of solute present in 1 liter of solution.
The medical field often uses mass-volume percentage, such as the 0.9% NaCl concentration in physiological saline, or mg/dL (milligrams per deciliter) as is common for measuring glucose levels in blood.