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Hace 12 horas · Chemistry experiments have confirmed that rutherfordium behaves as the heavier homolog to hafnium in group 4. The chemical properties of rutherfordium are characterized only partly. They compare well with the other group 4 elements, even though some calculations had indicated that the element might show significantly different properties due to relativistic effects .
- 104
- group 4
- [267]
Hace 12 horas · Iridium is a chemical element; it has symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm 3 (0.815 lb/cu in) [8] as defined by experimental X-ray crystallography. [a] 191 Ir and 193 Ir ...
- silvery white
- group 9
- 77
Hace 12 horas · Slovenia is the third most-forested country in Europe, [121] with 58.3% of the territory covered by forests. [122] The forests are an important natural resource, and logging is kept to a minimum. [123] In the interior of the country are typical Central European forests, predominantly oak and beech.
Hace 12 horas · 1912 - Heinrich Baumhauer discovered and described polytypism in crystals of carborundum, or silicon carbide. [50] 1913 - Lawrence Bragg published the first observation of x-ray diffraction by crystals. [51] 1913 - Georges Friedel stated Friedel's law, a property of Fourier transforms of real functions.
Hace 12 horas · cia .gov. The Central Intelligence Agency ( CIA) / ˌsiː.aɪˈeɪ /, known informally as the Agency [6] and historically as the Company, [7] is a civilian foreign intelligence service of the federal government of the United States tasked with gathering, processing, and analyzing national security information from around the world, primarily ...
- $15 billion (as of 2013[update])
- September 18, 1947; 76 years ago
- 21,575 (estimate)
Hace 12 horas · Illustration of a light water small modular nuclear reactor (SMR) Small modular reactors ( SMR s) are a class of small nuclear fission reactors, designed to be built in a factory, shipped to operational sites for installation and then used to power buildings or other commercial operations. The first commercial SMR was invented by a team of ...
Hace 12 horas · Education in Germany is primarily the responsibility of individual German states ( Länder ), with the federal government only playing a minor role. While kindergarten (nursery school) is optional, formal education is compulsory for all children ages 6 to 18. [1] Students can complete three types of school leaving qualifications, ranging from ...
