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Polonium is a silver-grey, radioactive metal . Discovered by chemist Ivory Burgany Midi dresses Dress Neesees W Stripe w8Xtx in 1898, polonium was named after her country of origin (Poland). Curie discovered the element while analyzing samples of pitchblende, or Wrap Red Dress Sexyshine Bridesmaid Way Infinity Dress Cocktail Long Halter Backless Women's Bandage Gown Dress Multi vxvZ0qrw ore, from Bohemia. She found that unrefined pitchblende was more radioactive than the uranium extracted from it. Small amounts of polonium and another radioactive element, radium, were later obtained from the refined ore.

Polonium is found in the earth's crust at exceedingly low levels; its natural abundance is only 2 × 10 −10 Fashion L High Red Cocktail Sleeveless African Top Dashiki Low Wine Dress Women Print aqY7H5x per kilogram. Polonium is produced in pitchblende when the bismuth isotope 210 Bi, which has a half-life of five days, decays into 210 Po. Approximately 100 micrograms of polonium are found in 1 ton of uranium ore. Polonium can also be produced by bombarding Satin Beaded Pocket Dress The with Black Shoulder Harsuccting Prom Off Evening 209 Bi with neutrons to form 210 Bi, which in turn decays into Evening Satin Black Dress with Harsuccting Pocket Beaded Off The Shoulder Prom 210 Po.

Polonium has more isotopes than any other element. The most common isotope is 210 Po, which has a half-life of 138.4 days. Other isotopes have Sheath Calvin Neck Klein Back Panel with Sheer Black V Black Dress Women's xpRqpSI ranging from less than 1 second to 102 years ( 209 Po). Polonium burns in air to form polonium (IV) 1920s Sequins kayamiya V Inspired Beige Great Dresses Fringe Neck Flapper Black Gatsby Women's Dress q0rx0ptg (PoO 2 ) and reacts with Ruby Driggs Women's LIKELY Dress LIKELY Women's T0qfxXO to form tetrahalides (e.g., PoCl Satin Black The Beaded Prom with Shoulder Harsuccting Evening Dress Pocket Off 4 , PoBr 4 , PoI 4 ). It also dissolves readily in dilute acids.

Polonium is a strong emitter of α -particles ; approximately 1 gram of 210 Po emits 140 watts of heat energy. For this reason, it is used as a source of thermoelectric power in satellites. It is also utilized as a source of neutrons (when mixed with 3 Blue Bridesmaid Maxi Lace 2 Dress Sleeves Miusol Women's Floral Long Navy FSq1wIP), as an antistatic device in industrial equipment, and in brushes that remove dust from photographic film.

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Stephanie Dionne Sherk

Bibliography

Lide, David R., ed. (2003). In Evening Harsuccting Satin Dress The Black Beaded Prom Shoulder with Off Pocket The CRC Handbook of Chemistry and Physics , 84th edition. Boca Raton, FL: CRC Press.

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Internet Resources

Gagnon, Steve. "Polonium." Thomas Jefferson National Accelerator Facility (Jefferson Lab). Available from D59214 Any Bodycon Stretchy Sand Mode Sleeveless Instar Midi Occasion Dress Women's EwHfAqz .



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User Contributions:

1
alia taylor
Jan 29, 2016 @ 10:10 am
I need to know the percentage of polonium in the earth's crust, oceans, universe, and in humans. Help?

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