Magnesium Hydroxide is a naturally occurring inorganic base that is not harmful. Its aqueous solution is known as milk of magnesia, which is a popular antacid. Magnesium Hydroxide has the chemical formula Mg(OH)2. Furthermore, the same is said to have a molar mass of 58.32 g/mol. The two hydroxyl groups are linked to the central Mg. Because it is ionic, the molecule mostly occurs as Mg2+ and OH- ions. Magnesium Hydroxide is an odorless white solid form of magnesium. It weighs 2.34 g/mL and has a density of 2.34 g/mL. It has a melting point of 350 degrees Celsius. When present at extremely high temperatures, solid Magnesium Hydroxide undergoes an endothermic breakdown, which means it absorbs heat from the surrounding environment. It decomposes into Magnesium Oxide and water, making it an effective smoke suppressant and fire extinguisher. Magnesium Hydroxide is commonly used as an antacid due to its somewhat basic composition and lack of toxicity. As an antacid, it works by neutralizing the stomach acids of humans and avoiding indigestion and heartburn. It's used as an underarm deodorant, a laxative, an antiperspirant, a therapy for sores, a wastewater treatment, and a fire retardant. These were some physical properties, chemical properties and some uses of Magnesium Hydroxide but if not used with care be harmful. So, experiments with Magnesium Hydroxide or other chemicals should be done under adult supervision.