Reference Terms
from Wikipedia, the free encyclopedia

Isotope

Isotopes are forms of an element whose nuclei have the same atomic number–-the number of protons in the nucleus--but different mass numbers because they contain different numbers of neutrons.

Note:   The above text is excerpted from the Wikipedia article "Isotope", which has been released under the GNU Free Documentation License.
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August 2, 2015

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updated 12:56 pm ET