Polonium ( ) is a chemical element with the symbol Po and atomic number 84, discovered in 1898 by Marie and Pierre Curie.

Polonium has 33 known isotopes, all of which are radioactive.

Polonium is a radioactive element that exists in two metallic allotropes.

Polonium dissolves readily in dilute acids, but is only slightly soluble in alkalis.

Polonium has no common compounds, only synthetically created ones, and more than 50 of those are known.

Polonium hydride () is a volatile liquid at room temperature prone to dissociation.

Polonium dihalides are formed by direct reaction of the elements or by reduction of PoCl < sub > 4 </ sub > with SO < sub > 2 </ sub > and with PoBr < sub > 4 </ sub > with H < sub > 2 </ sub > S at room temperature.

The brother of Doctor Magnus attempts to avert a catastrophic future and prevent the creation of the group, and uses a device stolen from the villain T. O. Morrow to change the Metal into evil, radioactive versions based on other metals, called the Death Metal Men ( Uranium ( Iron ), Strontium ( Mercury ), Thorium ( Platinum ), Radium ( Gold ), Lithium ( Copper ), Polonium ( Lead ) and Fermium ( Tin )).

It used an electrode doped with Polonium 210, a radioactive isotope with a half-life of 138 days.

There's Polonium.

The US government used Postum as a code name for Polonium, used in the Urchin style nuclear weapon initiators.

** Polonium in London: 1.

** Polonium in London: 2.

** Polonium in London: 4.

** Polonium in London: 6.

** Polonium in London: 8.

** Polonium in London: 10.

** Polonium in London: 12.

** Polonium in London: 13.

** Polonium in London: 14.

** Polonium in London.

** Polonium in London: Litvinenko in London.

** Polonium in London: Litvinenko in London.

Curie worked extensively with radium, which decays into radon, along with other radioactive materials that emit beta and gamma rays.

Of these 14 transient elements, 7 ( polonium, astatine, radon, francium, radium, actinium, and protactinium ) are relatively common decay products of thorium, uranium, and plutonium.

Also, three primordially occurring but radioactive actinides, thorium, uranium, and plutonium, decay through a series of recurrently produced but unstable radioactive elements such as radium and radon, which are transiently present in any sample of these metals or their ores or compounds.

Helium is typically separated from natural gas, and radon is usually isolated from the radioactive decay of dissolved radium compounds.

All isotopes of radium are highly radioactive, with the most stable isotope being radium-226, which has a half-life of 1601 years and decays into radon gas.

Thorium and uranium, their decay product radium, and its decay product radon, will therefore continue to occur for tens of millions of years at almost the same concentrations as they do now.

Examples of highly poisonous alpha-emitters are radium, radon, and polonium.

Unstable elements such as polonium, radium, and radon — which form through the decay of uranium and thorium — are also found in nature, despite their short half-lives.

Uranium-238 follows a sequence of decay through thorium, radium, radon, polonium, and lead.

In 1923, this element officially became radon ( the name given at one time to < sup > 222 </ sup > Rn, an isotope identified in the decay chain of radium ).

The radiation is produced by X-ray tubes, high energy X-ray equipment or natural radioactive elements, such as radium and radon, and artificially produced radioactive isotopes of elements, such as cobalt-60 and iridium-192.

While in the past radium and radon have both been used for radiography, they have fallen out of use as they are radiotoxic alpha radiation emitters which are expensive ; iridium-192 and cobalt-60 are far better photon sources.

However, some apatite in Florida used to produce phosphate for U. S. tobacco crops does contain uranium, radium, lead 210 and polonium 210 and radon.

Friedrich Ernst Dorn ( 27 July 1848 – 16 December 1916 ) was a German physicist who was the first to discover that a radioactive substance, later named radon, is emitted from radium.

Not only are unstable radium isotopes significant radioactivity emitters, but as the next stage in the decay chain they also generate radon, a heavy, inert, naturally occurring radioactive gas.

" Beginning with naturally occurring thorium-232, this series includes the following elements: actinium, bismuth, lead, polonium, radium, and radon.

It is the chemistry of radioactive elements such as the actinides, radium and radon together with the chemistry associated with equipment ( such as nuclear reactors ) which are designed to perform nuclear processes.

Beginning with naturally occurring uranium-238, this series includes the following elements: astatine, bismuth, lead, polonium, protactinium, radium, radon, thallium, and thorium.

There is a measurable level of radioactivity primarily due to dissolved radon gas, with some radium.

It also held very high concentrations of thorium and radium ( and their decay products, including radon gas ) which are retained in the tailings ( residues ).

Robley D. Evans made the first measurements of exhaled radon and radium excretion from a former dial painter in 1933.