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  2. Tantalum - Wikipedia

    en.wikipedia.org/wiki/Tantalum

    [68] [67] [69] Because of its ductility, tantalum can be drawn into fine wires or filaments, which are used for evaporating metals such as aluminium. Tantalum is inert against most acids except hydrofluoric acid and hot sulfuric acid, and hot alkaline solutions also cause tantalum to corrode. This property makes it a useful metal for chemical ...

  3. Group 5 element - Wikipedia

    en.wikipedia.org/wiki/Group_5_element

    There are 2 parts per million of tantalum in the Earth's crust, making it the 51st most abundant element there. Soil contains on average 1 to 2 parts per billion of tantalum, and seawater contains 2 parts per trillion of tantalum. A typical human contains 2.9 parts per billion of tantalum. Tantalum is found in the minerals tantalite and ...

  4. Isotopes of tantalum - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_tantalum

    Natural tantalum (73 Ta) consists of two stable isotopes: 181 Ta (99.988%) and 180m Ta (0.012%). There are also 35 known artificial radioisotopes, the longest-lived of which are 179 Ta with a half-life of 1.82 years, 182 Ta with a half-life of 114.43 days, 183 Ta with a half-life of 5.1 days, and 177 Ta with a half-life of 56.56 hours.

  5. Metal allergy - Wikipedia

    en.wikipedia.org/wiki/Metal_allergy

    It can be difficult to identify and avoid the allergen, because many metals are common in the environment, and some are biologically necessary to humans. Regulations have successfully reduced the rates of some metal allergies in Europe, but are not widespread. The social and economic costs of metal allergies are high.

  6. Tantalum pentoxide - Wikipedia

    en.wikipedia.org/wiki/Tantalum_pentoxide

    Tantalum ores often contain significant amounts of niobium, which is itself a valuable metal.As such, both metals are extracted so that they may be sold. The overall process is one of hydrometallurgy and begins with a leaching step; in which the ore is treated with hydrofluoric acid and sulfuric acid to produce water-soluble hydrogen fluorides, such as the heptafluorotantalate.

  7. Period 2 element - Wikipedia

    en.wikipedia.org/wiki/Period_2_element

    A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases; a new row is started when chemical behavior begins to repeat, creating columns of elements with similar properties.

  8. Organotantalum chemistry - Wikipedia

    en.wikipedia.org/wiki/Organotantalum_chemistry

    Tantalum alkylidene complexes arise by treating trialkyltantalum dichloride with alkyl lithium reagents. This reaction initially forms a thermally unstable tetraalkyl-monochloro-tantalum complex, which undergoes α-hydrogen elimination, followed by alkylation of the remaining chloride.

  9. Toxic heavy metal - Wikipedia

    en.wikipedia.org/wiki/Toxic_heavy_metal

    Tetraethyl lead is one of the most significant heavy metal contaminants in recent use. [15] Toxic metals are found naturally in the earth, and become concentrated as a result of human activities, or, in some cases geochemical processes, such as accumulation in peat soils that are then released when drained for agriculture. [16]