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There are different reasons to not lick them too. Some of them will explode if you lick them.
which ones? asking for a friend.
The alkali metals. Starting with lithium, but it probably won’t explode, just burn. Sodium, potassium, and rubidium will explode from your saliva. Cesium and francium will explode just from the moisture in the air.
what’s wrong with osmium?
In contact with air, it can form the tetroxide, which is pretty toxic.
I wouldn’t lick Cesium
Lead: “Maybe not a good idea”
US infrastructure: “So maybe it’s not a bad idea either? Keep using it in the pipes.”
