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Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites. The ratio of 26 Al to 10 Be has been used to study the role of sediment transport, deposition, and storage, as well as burial times, and erosion, on 10 5 to 10 6 year time scales.
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Aluminium (or aluminum in North American English) is a chemical element; it has symbol Al and atomic number 13. Aluminium has a density lower than that of other common metals, about one-third that of steel. It has a great affinity towards oxygen, forming a protective layer of oxide on the surface when exposed to air.
Aluminium-26 can be used to calculate the terrestrial age of meteorites and comets.It is produced in significant quantities in extraterrestrial objects via spallation of silicon alongside beryllium-10, though after falling to Earth, 26 Al production ceases and its abundance relative to other cosmogenic nuclides decreases.
Main isotopes of aluminium; Main isotopes [1] Decay; abundance half-life (t 1/2) mode ... It contains a table of main isotopes and eventually the standard atomic ...
The Liberal Democracy period in Indonesia (Indonesian: Demokrasi Liberal), also known as the Era of Parliamentary Democracy, was a period in Indonesian political history, when the country was under a liberal democratic system. During this period, Indonesia held its first and only free and fair legislative election until 1999, but also saw ...
Guided Democracy (Indonesian: Demokrasi Terpimpin) was the political system in place in Indonesia from 1959 until the New Order began in 1966. It was the brainchild of President Sukarno, and was an attempt to bring about political stability. Sukarno believed that Western-style democracy was inappropriate for Indonesia's situation.
Of the 26 "monoisotopic" elements that have only a single stable isotope, all but one have an odd atomic number—the single exception being beryllium. In addition, no odd-numbered element has more than two stable isotopes, while every even-numbered element with stable isotopes, except for helium, beryllium, and carbon, has at least three.