Which of the following micronutrients is not considered an electrolyte?

Iron is not classified as an electrolyte because it does not dissociate into ions in solution and does not conduct electricity, which is the defining characteristic of electrolytes. Electrolytes primarily include minerals that dissolve in bodily fluids and carry an electrical charge, helping to regulate various physiological functions such as fluid balance, muscle contractions, and nerve signaling. Sodium, chloride, and potassium are all electrolytes because they can ionize in the body, allowing them to play critical roles in maintaining cellular function, hydration, and overall homeostasis.

In contrast, iron is an essential micronutrient involved primarily in oxygen transport and cellular metabolism, but it does not function as an electrolyte in the same way as the other minerals listed.