What does the element krypton look like?

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For some reason, a lot of people want to know what the element krypton looks like. It turns out that you look at krypton every day, although you may not actually see it. Krypton is one of the gases that makes up the earth's atmosphere. But in small amounts only. Roughly the earth's atmosphere is 0.0001% krypton, or about one part per million. Krypton is a colorless, odorless gas that rarely reacts with other elements. A container full of krypton gas looks just like a container full of air. It isn't very exciting. Things become more interesting when an electric current is sent through a container of low pressure krypton. When this is done, krypton lights up in much the same way a fluorescent light bulb does and glows with a smokey-white light. This glowing gas is called a plasma.