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isotopes - 3 dictionary results
i⋅so⋅tope
[ahy-suh-tohp] 
səˌtoʊp
–noun Chemistry.
| any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties. |
Related forms:
i⋅so⋅top⋅ic [ahy-suh-top-ik] , adjective
[ahy-suh-top-ik] , adjective i⋅so⋅top⋅i⋅cal⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source
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Link To isotopes
| i·so·tope (ī'sə-tōp') n. One of two or more atoms having the same atomic number but different mass numbers. [iso- + Greek topos, place (so called because the isotopes of a chemical element occupy the same position in the periodic table of elements).] i'so·top'ic (-tŏp'ĭk) adj., i'so·top'i·cal·ly adv. |
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
| isotope (ī'sə-tōp') Pronunciation Key
One of two or more atoms that have the same atomic number (the same number of protons) but a different number of neutrons. Carbon 12, the most common form of carbon, has six protons and six neutrons, whereas carbon 14 has six protons and eight neutrons. Isotopes of a given element typically behave alike chemically. With the exception of hydrogen, elements found on Earth generally have the same number of protons and neutrons; heavier and lighter isotopes (with more or fewer neutrons) are often unstable and undergo radioactive decay. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2009, Dictionary.com, LLC. All rights reserved.
