@futzle @Unixbigot @brad There's a lot of problems with the radioactive elements. Many of them should be yellow. Polonium is probably the only one to really hit the bar of 'ya dead'.

There's a missing category for the bottom row: "good luck trying". A lot of the elements starting around Fermium just aren't produced in lickable amounts, and as you get heavier, a large number of those don't have chemical properties, because we've only produced a few atoms at a time.