Chemical warfare dates back thousands of years, but the first large-scale use of chemical weapons was during World War I. Austria-Hungary, France, the German Empire, the United Kingdom, and the United
A French gas attack on German trenches in Flanders, Belgium (1917).
Russian Red Cross nurses tend to gassed Russians brought from the front lines, 1915
British emplacement after German gas attack (probably phosgene)
A bell used as a gas alarm, December 1916.
Chlorine
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Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly
Chemical weapons in World War I
…nature of gas clouds would be most effective. The types of weapons employed ranged from disabling chemicals, such as tear gas, to lethal agents like chlorine, phosgene, and mustard gas. In survivors, gas attacks caused medical problems and a strong psychological impact. This chemical warfare was a major…
Chlorine in bottle
Carl Wilhelm Scheele, discoverer of chlorine
Solid chlorine at −150 °C
Chlorine, liquefied under a pressure of 7.4 bar at room temperature, displayed in a quartz ampule embedded in acrylic glass