The third of the Noble Gases, Argon makes up a percent of the air we breathe and is accordingly commonplace. Its spectral emission is blue, and its root word is the Greek argos, meaning stable. It is used wherever a non-reactive gas is needed – as, for instance, where ordinary air might cause oxidation or ignition. It is non-toxic, but owing to its weight it is used to smother chickens. As a character, Argon is hard-working, dependable, bull-headed, remorseless and possessed of steady nerves. She represents earthy virtues and is the opposite number to the exotic Xenon.