Editing Period 6 element (section)

===Osmium===
{{main|Osmium}}
'''Osmium''' is a [[chemical element]] with the symbol '''Os''' and [[atomic number]] 76. It is a hard, brittle, blue-gray or blue-black [[transition metal]] in the [[platinum family]] and is the densest naturally occurring element, with a [[density]] of  {{val|22.59|ul=g/cm3}} (slightly greater than that of [[iridium]] and twice that of [[lead]]). It is found in nature as an alloy, mostly in platinum ores; its [[alloy]]s with [[platinum]], [[iridium]], and other platinum group metals are employed in [[fountain pen]] tips, electrical contacts, and other applications where extreme durability and hardness are needed.<ref>Hammond "Osmium", C. R., p. 4-25 in {{RubberBible86th}}</ref>