Normal, functioning kidneys. 1  prevent the buildup of wastes and extra fluid in the body. 2  keep levels of electrolytes, such as potassium and phosphate, stable. 3  make hormones that help regulate blood pressure. 4  make red blood cells. 5  keep bones strong.
They lack only one electron to form a complete shell or subshell, and are extremely active chemically. Chemical activity increases as you move upward in the group, fluorine being the most active element in the Periodic Table. At room temperature, fluorine and chlorine are gases, bromine is liquid, and iodine is solid.They form diatomic molecules in the pure state. The halogens are poisonous, and chlorine gas and chlorine compounds have been used as chemical weapons.hey lack only one electron to form a complete shell or subshell, and are extremely active chemically. Chemical activity increases as you move upward in the group, fluorine being the most active element in the Periodic Table. At room temperature, fluorine and chlorine are gases, bromine is liquid, and iodine is solid.
1 Compounds containing bromine in the -1 oxidation state are called bromides. 2  Bromine is the tenth most abundant element in sea water with an abundance of 67.3 mg/L.3  Bromine is the 64th most abundant element in the Earth's crust with an abundance of 2.4 mg/kg. The only other element that is a liquid at room temperature is mercury. 2  Bromine is used in many fire retardant compounds. 3  Bromide compounds used to be used as sedatives. 4  The ancient royal purple dye called Tyrian Purple is a bromine compound. 5  Bromine was used in leaded fuels to help prevent engine knock.