astatine is radioactive and essentially unavailable in nature. (webelements.com)
Polonium is a radioactive element that exists in two metallic allotropes . (wikizero.com)
It is the lightest element whose isotopes are all radioactive . (knowpia.com)
Longest-lived isotope2
The longest-lived isotope, 210 At, has a half-life of only 8.3 hours. (webelements.com)
Because even the longest-lived isotope of technetium has a relatively short half-life (4.21 million years), the 1952 detection of technetium in red giants helped to prove that stars can produce heavier elements . (knowpia.com)
Bismuth4
Bombardment of the bismuth isotope 209 83 Bi with α-particles (helium nuclei, 4 2 He) results in formation of shortlived astatine and neutrons. (webelements.com)
The bismuth target is cooled during irradiation to prevent the volatile astatine disappearing. (webelements.com)
Heating the bismuth target to 300-600°C under N 2 results in a stream of the elemental astatine that can be collected on a cold glass finger. (webelements.com)
Today, polonium is usually produced in milligram quantities by the neutron irradiation of bismuth . (wikizero.com)
Atoms4
Astatine atoms have 85 electrons and the shell structure is 2.8.18.32.18.7. (webelements.com)
one suggestion is that small clusters of polonium atoms are spalled off by the alpha decay. (wikizero.com)
[9] [10] Although the neutral ground-state chemical compounds of argon are presently limited to HArF, argon can form clathrates with water when atoms of argon are trapped in a lattice of water molecules. (cloudfront.net)
These atoms have different possible forms: isotopes (same number of protons and electrons but different number of neutrons). (mendeleev.com)
Bromine1
For example, the halogens (such as chlorine and bromine) are known for their ability to form compounds with hydrogen, while the noble gases (such as helium and neon) are chemically unreactive. (mendeleev.com)
Neutrons1
Polonium has few applications, and those are related to its radioactivity: heaters in space probes , antistatic devices , sources of neutrons and alpha particles , and poison e.g. poisoning of Alexander Litvinenko . (wikizero.com)
Iodine1
Astatine is a halogen and possibly accumulates in the thyroid like iodine. (webelements.com)
Promethium-145 is the most stable promethium isotope, but the only isotope with practical applications is promethium-147, chemical compounds of which are used in luminous paint , atomic batteries and thickness-measurement devices. (wikipedia.org)
it decays directly to its stable daughter isotope , 206 Pb . (wikizero.com)
[8] Argon is chemically inert under most conditions and forms no confirmed stable compounds at room temperature. (cloudfront.net)
Theoretical calculation predicts several more argon compounds that should be stable [12] but have not yet been synthesized. (cloudfront.net)
Stable to water and oxygen but attacked by sulfur compounds in air to form black sulfide layer. (mindat.org)
Inorganic2
Magnetic susceptibility of the elements and inorganic compounds , in Handbook of Chemistry and Physics 81st edition, CRC press. (wikipedia.org)
In chemistry, a Sulfur Compound is a chalcogen compound , that may be organic compounds ( such as organosulfur compounds ) or inorganic compounds, that contain as an integral part of the molecule a sulfur atom (S) . (wellnessadvocate.com)
Hydrogen1
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of astatine where known. (webelements.com)
Chalcogen1
It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. (material-properties.org)
Abundance2
Where more than one isotope exists, the value given is the abundance weighted average. (rsc.org)
Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. (nuclear-power.com)
Electrons3
[4] In forming compounds, the atom loses its two outermost electrons and one of the 4f-electrons, which belongs to an open subshell. (wikipedia.org)
An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. (periodic-table.org)
Elements can also form compounds with one another, chemical reactions are the result of the interactions of electrons. (mendeleev.com)
Periodic Table1
On a standard periodic table, all eleven elements are in a diagonal region of the p-block extending from boron at the upper left to astatine at lower right. (wikipedia.org)
Argon2
In the universe, argon-36 is by far the most common argon isotope , as it is the most easily produced by stellar nucleosynthesis in supernovas . (cloudfront.net)
Although argon is a noble gas , it can form some compounds under various extreme conditions. (cloudfront.net)
The isotopic mass usually differs for other isotopes and is usually within 0.1 u of the mass number. (nuclear-power.com)
Technetium2
In 1937, technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name (from the Greek τεχνητός , technetos , from techne , as in "craft", "art" and having the meaning of "artificial", + -ium ). (knowpia.com)
Long-lived technetium isotopes produced commercially are byproducts of the fission of uranium-235 in nuclear reactors and are extracted from nuclear fuel rods . (knowpia.com)
Decay1
Select an isotope to calculate its radio activity decay. (easycalculation.com)
Uranium3
The two sources of natural promethium are rare alpha decays of natural europium -151 (producing promethium-147) and spontaneous fission of uranium (various isotopes). (wikipedia.org)
Due to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days) in uranium ores , as it is the penultimate daughter of natural uranium-238 . (wikizero.com)
Polonium was discovered in July 1898 by Marie Skłodowska-Curie and Pierre Curie , when it was extracted from the uranium ore pitchblende and identified solely by its strong radioactivity: it was the first element to be so discovered. (wikizero.com)
Boron2
Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. (periodic-table.org)
In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. (periodic-table.org)
Zirconium1
When present in compounds, zirconium exists mostly in the oxidation state IV. (chemicool.com)
Molybdenum1
Industrially, molybdenum compounds (about 14% of world production of the element) are used in high-pressure and high-temperature applications as pigments and catalysts . (knowpia.com)