Bismuth

Interesting facts about Bi, mass 209 (the only stable isotope), atomic number 83.
It melts at 520 F, maybe possible in the oven.
It boils at 1833 K (2840 F). The ICP plasma I use is 8,000 - 10,000 K.

Not quite as toxic as other elements in the same group, arsenic and antimony. Bismuth is used in cosmetics. And it's in Pepto-Bismol

The most diamagnetic metal, a weak type of magnatism compared to ferro- or paramagnatism. It wouldn't stick to your fridge.

It is used as an internal standard, it is run through the mass spec with every sample at the same concentration, and I make sure the instrument gives the same result. One way to tell if the instrument drifts.
Around $8 / kg.