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Justine Beck
23 May, 07:18
The element of symbols: symbols to know
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Ellen Briggs
23 May, 08:00
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Chemical symbols are shorten abbreviations of the names of the 109 known elements. The use of symbols for the chemical elements existed long before a systematic method was developed. the alchemist associated the symbols of the planets not only with the days of the week, but also with the seven metals known at the time: gold, silver, iron, mercury, tin, copper, and lead. By the beginning of the nineteenth century, there were about 26 known elements, but by the beginning of the twentieth century, therer were more than 81.
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