[{"Bold_text": "noun", "List Items": ["Chemistry.a soft, silver-white, metallic element that oxidizes rapidly in moist air, occurring in nature only in the combined state, and used in the synthesis of sodium peroxide sodium peroxide, sodium cyanide sodium cyanide,and tetraethyllead: a necessary element in the body for the maintenance of normal fluid balance and other physiological functions.:Na;:22.9898;:11;:0.97 at 20°C.", "Medicine/Medical, Pharmacology.any salt of sodium, as sodium chloride sodium chlorideor sodium bicarbonate sodium bicarbonate,present in or added to foods or beverages as a seasoning or preservative and used in many pharmaceutical products as an , anticoagulant, or other agent."]}]