But that's neither here nor there. As the conversation drifted to radiation protection, my mind drifted considerably further. To stop your gammas, everyone uses lead. Lead, lead, lead. Sure, it's dense, and cheap. But what if money was no object? Everyone knows osmium is the densest element. Lead is about a buck a pound. While osmium is more like $400 an ounce ($6400/pound). So you can see the practical advantage of lead, even though the density of lead is a mere 11.3 grams/cc compared to osmium's beefy 22.6... twice as dense as lead.
But a couple things struck me about the list of elements sorted by density. WTF, dude, osmium's not at the bottom! Several manmade elements have 'estimated' densities that put osmium to shame. Hassium (Z=108) tops the list at 41 g/cc. Nearly twice the density of osmium!
But it seems awfully fishy. No references, and a rather ridiculous jump from osmium to these 'estimates' for these hypertransuranian elements that hardly exist in measurable quantities for measurable times.
Gosh, dubious information on Wikipedia? Alert the media.
Anyway, the other thing I learned from glancing through the table was that a couple months ago, ununbium officially became copernicium.
(And, while I'm being chemical, I note in passing the discovery of ununseptium was announced last week. [ununoctium was discovered earlier, and remains the current champion of Z])