Bromine

Fluorine, chlorine, bromine, iodine and astatine are halogens.

Toxic fumes of bromine can damage one's lungs.

First detected in 1985, the Antarctic ozone hole forms during the Southern Hemisphere’s late winter as the returning sun’s rays catalyze reactions involving man-made, chemically active forms of chlorine and bromine. These reactions destroy ozone molecules.

The current ozone hole area is still large compared to the 1980s, when the depletion of the ozone layer above Antarctica was first detected. This is because levels of ozone-depleting substances like chlorine and bromine remain high enough to produce significant ozone loss.

Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine are diatomic elements.