Elemental lead is mostly harmless. Lead ions are where you really start to get into trouble.
Edit: dont make a habit of eating lead, but licking it wont hurt you. People have been biting lead fishing sinkers for hundreds of years without any real issue.
Licking implies it is in solid or, charitably, liquid form. That makes all of the gases real bad to lick.
Tbh, I think I'd much prefer to try my luck licking Mercury rather than Uranium
I'd go with the uranium cause it's a rock and not liquid at room temperature, you're gonna get exposed to more liquid when you lick it than a rock
The thing about elemental mercury though is that it doesn't wet things like water or other liquid metals like Gallium do. The surface tension is so strong that virtually none of it is going to end up staying on your tongue
Unrefined Uranium is unradioactive enough that just licking it probably wouldn't do lasting damage
Na and Cl, not individually, but people lick it all the time when they combine.
Not sure if licking Hydrogen is such a good idea...
