Every element, sorted by one question: can I lick it?
Green means it’s probably fine, yellow means maybe not a good idea, red means you really shouldn’t, and purple means please reconsider. Everything in purple is radioactive. The red ones on the far left, sodium, potassium, rubidium and caesium, react with water, including the water in your mouth, and arsenic, mercury and thallium are red for reasons any murder mystery will explain. Please don’t check my work.
Source: Wikipedia on the alkali metals.
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