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- A building block of
matter; combination of
protons,
neutrons, and
electrons,
of which more than 110 kinds are now known.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- According to the atomic theory, the smallest particle of an element that
can exist either alone or in combination with similar particles of the
same element or of a different element. The smallest particle of an
element that enters into the composition of a molecule.
Webster 3rd
Source:
Dictionary of Mining, Mineral, and Related Terms
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