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I think some of those purple ones should instead be labeled “If you can find a way to get it to stick around long enough for you to lick, you’ll win a posthumous Nobel prize.”
Licking elemental Lithium would be enlightening.
I’d argue that Li should be red and Hg should be yellow.
Elemental mercury in liquid form is fairly safe. It needs to get into your blood in order to be a problem, and even if some does stick to your tongue and get swallowed the digestive absorption is extremely low.