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United States – NEC 2008 Table 250.122 – Safeco Electric Supply; ... United States – OSHA, NFPA 70, NFPA 70E [21] Lightning protection standards
Both lithium-6 and lithium-7 produce tritium when irradiated by neutrons, and are thus useful for the production of tritium by itself, as well as a form of solid fusion fuel used inside hydrogen bombs in the form of lithium deuteride. The US became the prime producer of lithium between the late 1950s and the mid-1980s.
The hot gas has temperatures above 70 K, which was inferred from ammonia line ratios and appears to be closely associated with the innermost portions of the nuclear bar seen in CO. [191] NH 3 was also monitored by VLA toward a sample of four galactic ultracompact HII regions: G9.62+0.19, G10.47+0.03, G29.96-0.02, and G31.41+0.31.
Niobium is a lustrous, grey, ductile, paramagnetic metal in group 5 of the periodic table (see table), with an electron configuration in the outermost shells atypical for group 5. Similarly atypical configurations occur in the neighborhood of ruthenium (44) and rhodium (45).
Aniline and its ring-substituted derivatives react with nitrous acid to form diazonium salts. One example is benzenediazonium tetrafluoroborate . Through these intermediates, the amine group can be converted to a hydroxyl ( −OH ), cyanide ( −CN ), or halide group ( −X , where X is a halogen ) via Sandmeyer reactions .
Cigarette filters are the most common form of litter in the world, as approximately 5.6 trillion cigarettes are smoked every year worldwide. [165] Of those, an estimated 4.5 trillion cigarette filters become litter every year. [166] To develop an idea of the waste weight amount produced a year the table below was created.