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The periodic table is a table of the chemical elements arranged to illustrate patterns of recurring chemical and physical properties. ... In 1870, Russian chemist Dmitry Mendeleev used these similarities to construct the original periodic table. Since that time, recently discovered elements have been added and the table’s layout has changed. However, the modern periodic table conveys essentially the same information as the one that Mendeleev created. ...
Today’s periodic classification of the elements depends on atomic structure and more specifically, the way in which the energy levels of electrons in atoms are arranged. ... The atomic number of an element, which is the number of protons the element maintains, also describes the number of electrons the element contains because all elements in the periodic table have a neutral charge.
Approximate Word count = 593
Approximate Pages = 2.4
(250 words per page double spaced)
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