Which of the following cations has the highest concentration in the human body?

Question

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Calcium (Ca2+) has the highest concentration of any cation in the human body, with an average concentration of about 1200 mg/L. It is mainly present in bones and teeth, but also plays important roles in muscle contraction, nerve transmission, and blood clotting. Sodium (Na+) and potassium (K+) cations are also present in significant amounts, but at lower concentrations than calcium. Zinc (Zn2+) and iron (Fe2+) are trace elements found in much lower concentrations, although they still play important roles in various biological processes.

Which of the Following Cations Has the Highest Concentration in the Human