8 Osmium-Platinum
Name SymbolAtomic numberAtomic weightBoiling pointMelting PointDensity
Osmium Os 76 190.2 5012 C 3033 C 22.6 g/cm3
Iridium Ir 77 192.2 4428 C 2447 C 22.4 g/cm3
PlatinumPt 78 195.1 3827 C 1769 C 21.5 g/cm3

notes: While Osmium is the heaviest known element, Iridium is so close that for a long time it was uncertain which was heavier.(Is this correct?)
Platinum is fairly inert, but is an exellent catalyst for many reactions, and is a component of most fuel cells.
[Elements by Group] [Elements by Atomic Number] [Elements by Name] [The Table] [Title Page]
By the way, these pages are still under construction, so if there are any errors, links to the wrong places, or non-functioning links, please e-mail me at 104742.1507@compuserve.com, or if you are on Compuserve, my member ID is (big surprise!) 104742,1507.

1