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Periodic table

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 table[]

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



Characteristics[]

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 elements[]

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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