Youtor
Osmium
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http://youtube.com/watch?v=xo1Eu1HDqHA
Osmium is the densest of all naturally occurring elements: 250 ml (8.5 fl oz) of this metal (in its liquid form) weighs 5.5 kg (12 lb). This rare element is found in the ore osmiridium. • Pure osmium reacts with oxygen in the air to form a poisonous oxide, so the metal is used safely by combining it with other elements or alloys. A red osmium oxide stains cells so they can be seen clearly under a powerful microscope, while a black oxide powder allows fingerprints to be revealed in crime investigations. A hard osmium alloy is used in fountain pen nibs. • • #allinfobits • #periodictable • #dblock • #transitionmetals • #osmium
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