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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 is a silvery-gray radioactive metal with an appearance similar to platinum, commonly obtained as a gray powder. [25] The crystal structure of the bulk pure metal is hexagonal close-packed. Atomic technetium has characteristic emission lines at wavelengths of 363.3 nm, 403.1 nm, 426.2 nm, 429.7 nm, and 485.3 nm. [26]
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.
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 ...
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
Pure thulium metal has a bright, silvery luster, which tarnishes on exposure to air. The metal can be cut with a knife, [10] as it has a Mohs hardness of 2 to 3; it is malleable and ductile. [11] Thulium is ferromagnetic below 32 K, antiferromagnetic between 32 and 56 K, and paramagnetic above 56 K. [12]
The compound can be synthesised by heating of technetium powder in a jet of fluorine diluted with nitrogen: 2Tc + 5F 2 → 2TcF 5 Another way to prepare it is the effect of iodine on technetium hexafluoride solution in iodine pentafluoride : [ 5 ]
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)).