Sulfur has four stable isotopes, 20 radioactive ones, and one isomer. (wikipedia.org)
Selenium has six observationally stable or nearly stable isotopes, 26 radioactive isotopes, and 9 isomers. (wikipedia.org)
Tellurium has eight stable or nearly stable isotopes, 31 unstable ones, and 17 isomers. (wikipedia.org)
In addition to the stable isotopes, some radioactive chalcogen isotopes occur in nature, either because they are decay products, such as 210Po, because they are primordial, such as 82Se, because of cosmic ray spallation, or via nuclear fission of uranium. (wikipedia.org)
Oxygen7
Group 16 consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv). (wikipedia.org)
Often, oxygen is treated separately from the other chalcogens, sometimes even excluded from the scope of the term "chalcogen" altogether, due to its very different chemical behavior from sulfur, selenium, tellurium, and polonium. (wikipedia.org)
Sulfur has more than 20 allotropes, oxygen has nine, selenium has at least eight, polonium has two, and only one crystal structure of tellurium has so far been discovered. (wikipedia.org)
Not counting oxygen, organic sulfur compounds are generally the most common, followed by organic selenium compounds and organic tellurium compounds. (wikipedia.org)
Among the lighter chalcogens (oxygen and sulfur), the most neutron-poor isotopes undergo proton emission, the moderately neutron-poor isotopes undergo electron capture or β+ decay, the moderately neutron-rich isotopes undergo β− decay, and the most neutron rich isotopes undergo neutron emission. (wikipedia.org)
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of lithium where known. (shef.ac.uk)
Stable to water and oxygen but attacked by sulfur compounds in air to form black sulfide layer. (mindat.org)
Neutron3
The middle chalcogens (selenium and tellurium) have similar decay tendencies as the lighter chalcogens, but no proton-emitting isotopes have been observed, and some of the most neutron-deficient isotopes of tellurium undergo alpha decay. (wikipedia.org)
Today, polonium is usually produced in milligram quantities by the neutron irradiation of bismuth . (wikizero.com)
In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. (periodic-table.org)
Chalcogens1
This trend also occurs with chalcogen pnictides and compounds containing chalcogens and carbon group elements. (wikipedia.org)
Hydrogen1
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)
Allotropes1
Polonium is a radioactive element that exists in two metallic allotropes . (wikizero.com)
the most stable livermorium isotope is 293Lv, which has a half-life of 0.061 seconds. (wikipedia.org)
Chalcogen2
There are numerous organic chalcogen compounds. (wikipedia.org)
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)
Protons1
These atoms have different possible forms: isotopes (same number of protons and electrons but different number of neutrons). (mendeleev.com)
Atoms2
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)
Sulphur1
The same plan of four funnels opening on the faces of a tetrahedron is found in all these elements, but Magnesium and Sulphur have no central globe, and in Cadmium and Tellurium the globe becomes a cross. (narod.ru)
Uranium4
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)
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)
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)
Arsenic1
Arsenic metabolism is affected by tissue and blood levels of zinc, selenium, arginine, choline, methionine, taurine, and quaniacetic acid, all of which affect methyl-group metabolism and polyamine synthesis which is the site of arsenic function in human physiology. (mighty-90.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)
Oxidation1
number of an element in a particular compound represents the extent of oxidation or reduction of an element during its change from free state into that compound. (studyres.com)
Promethium1
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)
Mass3
Most of these elements have several common characteristics: (1) They have low atomic mass. (2) The relative mass difference between their isotopes is large. (studyres.com)
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)
The isotopic mass usually differs for other isotopes and is usually within 0.1 u of the mass number. (nuclear-power.com)
[8] Argon is chemically inert under most conditions and forms no confirmed stable compounds at room temperature. (cloudfront.net)
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)
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)
Occur1
Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. (periodic-table.org)
Abundance1
Where more than one isotope exists, the value given is the abundance weighted average. (rsc.org)
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)
Element2
21. Which of the following is the same for isotopes of an element? (studyres.com)
It is the lightest element whose isotopes are all radioactive . (knowpia.com)
Traces1
The most common naturally occurring isotope is 99 Tc, in traces only. (knowpia.com)
Occurs1
This is the Se10 group found in the funnel of Selenium and which occurs frequently. (narod.ru)
Neodymium2
The ages and timelines of Martian rock formation can be calculated from the amount of neodymium and tungsten isotopes present. (chemicool.com)
Neodymium usually exists as a trivalent ion, Nd 3+ , in its compounds. (chemicool.com)
Predict1
He also studied the properties of compounds and was able to predict the properties of new compounds. (mendeleev.com)
Commonly1
Selenium is an important nutrient (among others as a building block of selenocysteine) but is also commonly toxic. (wikipedia.org)
Naturally1
Polonium is most available in naturally occurring actinide-containing materials. (wikipedia.org)
Form2
Although argon is a noble gas , it can form some compounds under various extreme conditions. (cloudfront.net)
The transition metals are known for their ability to form complex ions and colored compounds. (mendeleev.com)
Half-life4
Though longer-lived isotopes exist, such as the 125.2 years half-life of polonium-209, they are much more difficult to produce. (wikizero.com)
The process yielded the isotope californium-245 which has a half-life of 44 minutes. (rsc.org)
Am-Americum are radioactive isotopes and have a half-life of 7,950 years. (mighty-90.com)
At-Atatine is a radioactive isotope with an extremely short half-life of 7.2 to 8 hours. (mighty-90.com)
Common1
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)
Alpha1
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)