An element in this group is combined with its potassium salt in Lugol's solution. One of these elements was the last naturally occurring element to be discovered, and two more of them are found in a certain class of ozone-destroying chemicals. These elements, which contain five electrons in the p subshell, often form negative one oxidation states. For 10 points, name this group that contains astatine, iodine, bromine, chlorine, and fluorine and is found one group to the 
An element in this group is combined with its potassium salt in Lugol's solution. One of these elements was the last naturally occurring element to be discovered, and two more of them are found in a certain class of ozone-destroying chemicals. These elements, which contain five electrons in the p subshell, often form negative one oxidation states. For 10 points, name this group that contains astatine, iodine, bromine, chlorine, and fluorine and is found one group to the left of the noble gases.
An element in this group is combined with its potassium salt in Lugol's solution.
{halogens} [accept {halides}; accept {Group VIIA}; accept {Group 17}]