+**Chemical elements** are nature's fundamental pure substances, each defined by a unique number of protons in its [Atom](/wiki/atom). They cannot be broken down further by ordinary chemical means and are systematically organized in the [Periodic Table](/wiki/periodic_table). From the air we breathe to the stars above, these building blocks combine to form all known matter.
+## See also
+- [Matter](/wiki/matter)
+- [Compound](/wiki/compound)
+- [Molecule](/wiki/molecule)
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