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Undo revision 1282899 by DavidB4 (talk) Changed my mind
=== Chemical Element ===
=== Chemical Element ===
An [[Element]] is a single type of [[atom]], and is defined by its [[Atomic Number]], or the number of protons present in the [[nucleus]] of the atom. All known elements are grouped together in the [[Periodic table of the elements]].
{{main|Element}}
An Element is a single type of [[atom]], and is defined by its [[Atomic Number]], or the number of protons present in the [[nucleus]] of the atom. All known elements are grouped together in the [[Periodic table of the elements]].
=== Atom ===
=== Atom ===