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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 ...
This is consistent with the tendency of period 5 elements to resemble their counterparts in period 6 more than period 4 due to the lanthanide contraction. Unlike manganese, technetium does not readily form cations (ions with net positive charge). Technetium exhibits nine oxidation states from −1 to +7, with +4, +5, and +7 being the most ...
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.
Ruthenium red, [(NH 3) 5 Ru-O-Ru(NH 3) 4-O-Ru(NH 3) 5] 6+, is a biological stain used to stain polyanionic molecules such as pectin and nucleic acids for light microscopy and electron microscopy. [66] The beta-decaying isotope 106 of ruthenium is used in radiotherapy of eye tumors, mainly malignant melanomas of the uvea. [67]
(In any case, the typical oxidation states for the most accessible seventh-period elements thorium and uranium are too high to allow a direct comparison.) [11] Hydrogen has been included as a benchmark, although it is not a metal. Borderline germanium, antimony, and astatine have been included. Some other elements in the middle of the 4d and 5d ...
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
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)).