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Scientists have found that our bodies need 28 different elements to function properly. These are almost one-quarter of the periodic table and are mainly found in the first four periods.
1. Periodic Table as Arranged by Mendelejeff attention to the fact that “the eighth element, starting from a given one, is a kind of repetition of the first, like the eighth note of an octave in ...
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Both the figure and the table are something like a map or chart of matter on whichFig. 2. The periodic In this figure the periodic chain (fig. 1) is bent in a way that elements of similar ...