Visit this website and locate the element chlorine, whose

chemical symbol is Cl. Click on the square to read about

the element.

Why is it important to use caution when handling

chlorine?

Chlorine is a respiratory irritant. The gas irritates the mucus membranes and the liquid burns the skin. As little as 3.5 ppm can be detected as an odor, and 1000 ppm is likely to be fatal after a few deep breaths. In fact, chlorine was used as a war gas in 1915.

Explanation: Chlorine is a very reactive element. Especially with water. It can react with water vapors in the atmosphere and cause a small explosion. This is why chlorine must be handled carefully.