Phlebotomy Technician Practice Exam (NCPT/CPT) 2025 - Free Phlebotomy Practice Questions and Study Guide

These symbols are used to represent different chemical elements, and they should not be confused with each other. For instance, the symbol "Na" stands for Sodium (A), not Nitrogen (B) or Nitrate (D). Similarly, "K" stands for Potassium (A), not Krypton (B) or Potassium (D). "CI" represents Chloride (A), not Chlorine (B), and "CO2" represents Carbon Dioxide (A), not Carbon (C) or Carbonate (D). Therefore, the correct answer is A as it correctly matches the symbols with their corresponding chemical elements.