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A period 5 element is one of the chemical elements in the fifth 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 behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall ...
Technetium exhibits nine oxidation states from −1 to +7, with +4, +5, and +7 being the most common. [32] Technetium dissolves in aqua regia, nitric acid, and concentrated sulfuric acid, but not in hydrochloric acid of any concentration. [25] Metallic technetium slowly tarnishes in moist air [32] and, in powder form, burns in oxygen.
Period 5 has the same number of elements as period 4 and follows the same general structure but with one more post transition metal and one fewer nonmetal. Of the three heaviest elements with biological roles, two (molybdenum and iodine) are in this period; tungsten, in period 6, is heavier, along with several of the early lanthanides.
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The Periodic 5 element section of the table is where the individual elements are able to each have the maximum number of stable isotopes. Although the first oddZ start out with very few, or none in the case of 43Tc Technetium, The evenZ are noted to have a large number. 50Sn Tin has 10 and 54Xe Xenon has nine and 48Cd Cadmium and 52Te Tellurium have 8. 54Xe Xenon only misses being stable at ...
Technetium was created by bombarding molybdenum atoms with deuterons that had been accelerated by a device called a cyclotron. Technetium occurs naturally in the Earth's crust in minute concentrations of about 0.003 parts per trillion. Technetium is so rare because the half-lives of 97 Tc and 98 Tc are only 4.2 million
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Despite being a metal, Technetium usually doesn't form positively charged ions, but Technetium halides like Technetium hexafluoride exist. TcF 6 is a nuisance in uranium enrichment as its boiling point (328.4 K (55.3 °C; 131.4 °F)) is very close to that of uranium hexafluoride (329.6 K (56.5 °C; 133.6 °F)).