What Is Platinum?
QUICK ANSWER
Platinum is a chemical element with atomic number 78 and the symbol Pt. It's a dense, malleable, silvery-white precious metal that's extremely resistant to corrosion. Platinum is rarer than gold and is used in jewelry, catalytic converters for vehicles, laboratory equipment, and certain chemotherapy drugs.
Platinum is one of the rarest and most chemically inert metals on Earth. Most people associate it with luxury jewelry and credit card status, but its biggest industrial use is actually cleaning car exhaust. Catalytic converters use platinum to convert harmful pollutants into less toxic gases, making this rare metal one of the most environmentally important elements in modern industry.
Where is platinum on the periodic table?
Platinum has atomic number 78, the symbol Pt, and sits in group 10 of the periodic table among the transition metals, alongside palladium and nickel. Its atomic mass is about 195. Six stable isotopes occur naturally, with Pt-195 being most common at 33.8%. Platinum was named by Spanish conquistadors who found it mixed with gold in South American rivers, calling it platina meaning 'little silver' because they considered it inferior. Pure platinum was first isolated in the 18th century, and the element makes up only about 5 ppb of Earth's crust.
What are the properties of platinum?
Platinum is dense at 21.45 g/cm³, slightly denser than gold. It melts at 1,768°C and is one of the most ductile metals known, second only to gold. The metal has a brilliant silvery-white luster that doesn't tarnish or oxidize at any temperature, making platinum jewelry essentially permanent. Platinum is highly resistant to acids and corrosion, dissolving only in hot aqua regia (a mix of nitric and hydrochloric acids). It's relatively soft for a metal at Mohs hardness 4-4.5, comparable to iron. Platinum is paramagnetic and conducts electricity well.
What is platinum used for?
Catalytic converters in vehicles consume more than 40% of mined platinum, where it catalyzes the conversion of carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful gases. Jewelry uses substantial amounts because of platinum's beauty and resistance to wear. Chemistry labs depend on platinum crucibles and electrodes that resist corrosion at high temperatures. Anti-cancer drugs based on cisplatin and carboplatin contain platinum. The metal is also used in fuel cells, hard disk drives, dental crowns, certain pacemakers, and as a catalyst in petroleum refining and chemical synthesis.
Why is platinum so valuable?
Platinum is among the rarest precious metals, with only about 200 tons mined annually worldwide compared to about 3,000 tons of gold. The vast majority comes from just two countries: South Africa and Russia. Mining is technically difficult because platinum is found in low concentrations and must be extracted from large volumes of ore. Demand from automakers for catalytic converters, jewelry, and industrial uses keeps prices high. Platinum was traditionally more valuable than gold, though gold has recently surpassed it due to investment demand and platinum's exposure to industrial demand cycles.
Platinum is the precious metal doing the most invisible public service. While people wear it in rings and watches, the larger story is that platinum quietly cleans the exhaust from billions of vehicles worldwide. Few elements are so essential to both luxury markets and global air quality at the same time.
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