The periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements. The chemical elements are arranged from left to right and top to bottom ...
Elements in the same horizontal row are in the same period. The periods are numbered from top to bottom. The period number is the same as the number of occupied electron shells.
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Scientists just found a bizarre atomic glitch where it shouldn’t exist
For years, physicists have mapped the stability of atomic nuclei with remarkable confidence. The periodic table, with its ...
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