Chlorine

There's a chance that tap water may contain harmful substances like chlorine and lead.

It's possible that the drinking water has chlorine, lead, or similar contaminants in it.

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

Of course chlorine can be very toxic.

Chlorine is one of the elements in the periodic table.

Putting chlorine in drinking water is the biggest advance in public health.

Table salt is composed of sodium and chlorine atoms.

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.

Chlorine in the air needs cold temperatures in the stratosphere and clouds to convert into a form of the chemical that eats ozone, Newman said. The clouds go away when it warms up.