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Periodic table.svg

The periodic table of the chemical elements

A chemical element is a type of atom that is distinguished by its atomic number; that is, by the number of protons in its nucleus.

Periodic tableEdit

Common examples of elements, also shown in peridic table, are hydrogen, carbon, nitrogen, and oxygen.



CharacteristicsEdit

Elements with atomic numbers 83 or higher (bismuth and above) are inherently unstable, and undergo radioactive decay. Of the first 82 elements, 80 have stable isotopes.

New elementsEdit

All chemical matter consists of these elements. New elements of higher atomic number are discovered from time to time, as products of artificial nuclear reactions.

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