chlorine
an element that was used was chlorinethere are some others such as tear and mustard gas
chlorine
Chlorine, which was used as a poisonous gas in World War I.
Chlorine gas was used as a weapon during World War I. Salt is Sodium chloride.
The common poison gas of WWI was Mustard Gas, a combination of Sulfur and Chlorine (C4H8Cl2S).
An example of a gas element is helium, which is a noble gas commonly used in party balloons and airships.
nickel
Chlorine gas was used as a poisonous gas in World War 1. It was one of the first chemical weapons employed in warfare and caused significant casualties and suffering among soldiers on the battlefield.
It was chlorine.
It was chlorine.
argon
carbon