August's Element of the Month:
Atomic Mass: 262 or so amu
Melting Point: Unknown (!)
Boiling Point: Unknown (!)
Bohrium is one of the fakey elements, so fakey in fact that it was not synthesized until 1981 (or possibly 1976) and not officially given its bona fides by the Fakey Element Referees (the "IUPAC/IUPAP Transfermium Working Group") until 1992. Its name was not officially agreed upon until 1997. Until then, "Bohrium" was in contention against "Nielsbohrium" for Element 107, and "Bohrium" was also in the ring with "Dubnium," which eventually won out, for Element 105. References from your school days might well have called Bohrium "Unnilseptium" (IUPAC/IUPAP Tranfermium Working Group argot for "Unnamed Element 107") or, if your school days were quite a ways back, "eka-rhenium," or perhaps they would have acted, quite correctly, as if no such thing existed.
Does such a thing exist? Occasionally, kind of. Possibly right now, in quantities that could very generously be described as "trace." The most stable isotope of Bohrium has a half-life of 61 seconds. Let's review the concept of "half-life": if you had a pound of Bohrium on your kitchen table, 61 seconds later half of it would be gone. Well, it wouldn't be absent, but it would have "decayed," which is to say shed one or more of its artificially added-on protons and transformed into another, marginally less fakey element. After 122 seconds, you'd only have a quarter pound of Bohrium left, as well as a number of other problems that would be beginning to demand your attention.
If this relentless erosion of your Bohrium stash seems unfair, keep in mind that other Bohrium isotopes have half-lives of, say, 8 milliseconds. If your pound of Bohrium was composed of that isotope, after a single second you would be down to 1/42,535,296,000,000,008,192,304,928,032,936,392,744 of a pound, which is to say 1/2,658,456,000,000,000,512,144,808,752,496,712,984 of an ounce, of Bohrium. At that point you would have (mostly) a pound of Dubnium that was itself rapidly shedding protons on its way back down to a lesser state of fakiness.
Lest this little thought experiment cause confusion, I should clarify that all of the Transfermium Working Groups in all the physics labs in the world, put together, have never produced anything even remotely resembling a meaningful fraction of a pound of Bohrium.
And by the way, it's not like Bohrium, Element 107, is the fakiest of the elements. They've synthesized them all the way up to Element 118, and indeed one of the ways than Bohrium has manifested itself is as part of the stepping-down process from even fakier Elements such as Meitnerium (#109) and Darmstadtium (#110). (And even more by the way: if you are used to #112, Copernicium, being the highest-numbered named element, then you missed the party this May when Flerovium (#114) and Livermorium (#116) were given their wings by the IUPAC/IUPAP boys.)
By modeling and extrapolating from real elements, it is both possible and diverting to predict what chemical properties a fakey element would have, if it existed, and what chemical reactions it could undergo. In this enterprising spirit, at least one team has brewed up a batch of Bohrium and then exposed it to chlorous acid. I picture guys in white coats muttering "come on Come On COME ON!!!" as they pour the acid onto the Bohrium, knowing that the Bohrium is decaying into not-Bohrium like sand slipping through their fingers. But they brought their chemicals together in time, and were able to create and detect a compound: bohrium oxychloride, which was apparently a lot like rhenium oxychloride, only much, much, much more expensive. It's interesting, don't you think, that even when pushed into fairly contrived configurations, the stuff of matter seems to still play according to a relatively succinct rulebook.