Somebody took the Periodic Table of Elements and created the "Can I Lick It?" version below. It makes sense that all the elements that are present in the air (e.g., nitrogen, oxygen, argon, neon) are safe, but it is a surprise that yttrium (Y) and cerium (Ce) are OK. I would stay away from licking lithium (Li), osmium (Os), and any of the other yellow elements, even if it's listed as "not a good idea". Interestingly, fluorine (F) is a "really shouldn't" when fluoride, the negatively charged ion of fluorine, is used in toothpaste and drinking water. Overall, there are a lot more "OKs" than I expected.
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