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.
Because of the greater temporary dipoles, bromine molecules are stickier than chlorine molecules. Chlorine molecules will break away from each other at much lower temperatures than bromine molecules - hence bromine is a liquid and chlorine is a gas at room temperature. This is the reason that (all other things being equal) bigger molecules have higher boiling points than small ones.