Iridium.

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Presentation transcript:

Iridium

Iridium is number 77 on the periodic table Transition metal Hard, dense, brittle, silver, shiny Melting point is 4,471°F (2,466°C)

The discovery 1803 English Chemist, Smithson Tennant London Found in residue when he dissolved crude platinum in aqua regia Aqua regia is a mixture of both hydrochloric and nitric acids Tennant also discovered osmium at the same time

The name The word ‘Iridium’ comes from the latin word ‘iris,’ which translates to rainbow. This name was assigned to because of its highly coloured salts

Uses hardening agent for platinum alloys With osmium, it forms an alloy that’s used for tipping pens and compass bearings make heavy-duty electrical contacts Radioactive isotopes of iridium are used in radiation therapy for cancer treatment

How it’s obtained From Platinum ores or a by-product of mining nickel/ copper

Citations https://www.chemicool.com/elements/iridium.html http://www.rsc.org/periodic-table/element/77/iridium https://education.jlab.org/itselemental/ele077.html