the periodic table
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a table of all the chemical elements, arranged according to the number of parts with a positive electric charge (protons) that they each have in their centre (nucleus)The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends
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hi mate, Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass.In 1869
He predicted the discovery of other elements, and left spaces open in his periodic table for them.
In 1886 French physicist Antoine Bequerel first discovered radioactivity.
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