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  2. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    It is followed by caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars.

  3. Iridium - Wikipedia

    en.wikipedia.org/wiki/Iridium

    Iridium in bulk metallic form is not biologically important or hazardous to health due to its lack of reactivity with tissues; there are only about 20 parts per trillion of iridium in human tissue. [22] Like most metals, finely divided iridium powder can be hazardous to handle, as it is an irritant and may ignite in air. [66]

  4. Platinum–iridium alloy - Wikipedia

    en.wikipedia.org/wiki/Platinum–iridium_alloy

    The international prototype of the kilogram (IPK) is an artifact standard of platinum–iridium alloy that was defined as having a mass of exactly one kilogram. Platinum–iridium alloys are alloys of the platinum group precious metals platinum and iridium. Typical alloy proportions are 90:10 or 70:30 (Pt:Ir).

  5. From Seagull Poop to Plutonium: The Most Valuable ... - AOL

    www.aol.com/gold-caviar-most-valuable-substances...

    Cost: $53.37 per gram. Iridium is a hard, silvery metal that is one of the rarest in the world. It’s also extremely corrosion resistant. Iridium is mainly used as a hardening agent for platinum ...

  6. Synthesis of precious metals - Wikipedia

    en.wikipedia.org/wiki/Synthesis_of_precious_metals

    The radioactivity in MBq per gram of each of the platinum group metals which are formed by the fission of uranium. Of the metals shown, ruthenium is the most radioactive. Palladium has an almost constant activity, due to the very long half-life of the synthesized 107 Pd, while rhodium is the least radioactive.

  7. Heavy metals - Wikipedia

    en.wikipedia.org/wiki/Heavy_metal_(elements)

    An average 70 kg human body is about 0.01% heavy metals (~7 g, equivalent to the weight of two dried peas, with iron at 4 g, zinc at 2.5 g, and lead at 0.12 g comprising the three main constituents), 2% light metals (~1.4 kg, the weight of a bottle of wine) and nearly 98% nonmetals (mostly water).

  8. Group 9 element - Wikipedia

    en.wikipedia.org/wiki/Group_9_element

    Iridium is the most corrosion-resistant metal known as it is not attacked by acids, including aqua regia. In the presence of oxygen, it reacts with cyanide salts. Traditional oxidants also react, including the halogens and oxygen at higher temperatures. Iridium also reacts directly with sulfur at atmospheric pressure to yield iridium disulfide.

  9. From Seagull Poop to Plutonium: The Most Valuable ... - AOL

    www.aol.com/finance/gold-caviar-most-valuable...

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