isotope

[ ahy-suh-tohp ]

/ ˈaɪ 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.

Origin of isotope

1910–15; iso- + -tope<Greek tópos place

OTHER WORDS FROM isotope

i·so·top·ic

[ahy-suh-top-ik], /ˌaɪ səˈtɒp ɪk/, adjectivei·so·top·i·cal·ly, adverb

Words nearby isotope

isotone, isotonia, isotonic, isotonic exercise, isotonic sodium chloride solution, isotope, isotope geology, isotopic number, isotopic spin, isotopy, isotretinoin

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for isotope

Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
After eight years, traces of the isotope are expected to be extremely low.
Was Yasir Poisoned? Arafat’s Body Exhumed|Dan Ephron|November 27, 2012|DAILY BEAST
There must be another one in either wing, for the isotope plant and the cartridge-case plant.
The Cosmic Computer|Henry Beam Piper
Why nail the "power metal" down to an isotope of gold with an atomic weight of 197?
Despoilers of the Golden Empire|Gordon Randall Garrett

Well, heavy water is made of one atom of oxygen plus two atoms of deuterium, which is the first isotope of hydrogen.
The Caves of Fear|John Blaine
An isotope is just a different variety of the ordinary kind of atom in each element.
The Caves of Fear|John Blaine

British Dictionary definitions for isotope

isotope

/ (ˈaɪsəˌtəʊp) /

noun

one of two or more atoms with the same atomic number that contain different numbers of neutrons

Derived forms of isotope

isotopic (ˌaɪsəˈtɒpɪk), adjectiveisotopically, adverbisotopy (aɪˈsɒtəpɪ), noun

Word Origin for isotope

C20: from iso- + Greek topos place

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for isotope

isotope

[ (eye-suh-tohp) ]

In physics, different forms of the same element, with nuclei that have the same number of protons but different numbers of neutrons. Isotopes are distinguished from each other by giving the combined number of protons and neutrons in the nucleus. For example, uranium 235 is the isotope of uranium that has 235 protons and neutrons in its nucleus rather than the more commonly occurring 238. All elements have isotopes.

Medical definitions for isotope

isotope

[ ī′sə-tōp′ ]

n.

One of two or more atoms having the same atomic number but different mass numbers.

Other words from isotope

i′so•top′ic (-tŏp′ĭk) adj.

Scientific definitions for isotope

isotope

[ ī′sə-tōp′ ]

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.

单词	isotope
释义	isotope [ ahy-suh-tohp ] / ˈaɪ 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. Origin of isotope 1910–15; iso- + -tope<Greek tópos place OTHER WORDS FROM isotope i·so·top·ic [ahy-suh-top-ik], /ˌaɪ səˈtɒp ɪk/, adjectivei·so·top·i·cal·ly, adverb Words nearby isotope isotone, isotonia, isotonic, isotonic exercise, isotonic sodium chloride solution, isotope, isotope geology, isotopic number, isotopic spin, isotopy, isotretinoin Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for isotope Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton. Are Comets the Origin of Earth’s Oceans?\|Matthew R. Francis\|December 14, 2014\|DAILY BEAST After eight years, traces of the isotope are expected to be extremely low. Was Yasir Poisoned? Arafat’s Body Exhumed\|Dan Ephron\|November 27, 2012\|DAILY BEAST There must be another one in either wing, for the isotope plant and the cartridge-case plant. The Cosmic Computer\|Henry Beam Piper Why nail the "power metal" down to an isotope of gold with an atomic weight of 197? Despoilers of the Golden Empire\|Gordon Randall Garrett Well, heavy water is made of one atom of oxygen plus two atoms of deuterium, which is the first isotope of hydrogen. The Caves of Fear\|John Blaine An isotope is just a different variety of the ordinary kind of atom in each element. The Caves of Fear\|John Blaine British Dictionary definitions for isotope isotope / (ˈaɪsəˌtəʊp) / noun one of two or more atoms with the same atomic number that contain different numbers of neutrons Derived forms of isotope isotopic (ˌaɪsəˈtɒpɪk), adjectiveisotopically, adverbisotopy (aɪˈsɒtəpɪ), noun Word Origin for isotope C20: from iso- + Greek topos place Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for isotope isotope [ (eye-suh-tohp) ] In physics, different forms of the same element, with nuclei that have the same number of protons but different numbers of neutrons. Isotopes are distinguished from each other by giving the combined number of protons and neutrons in the nucleus. For example, uranium 235 is the isotope of uranium that has 235 protons and neutrons in its nucleus rather than the more commonly occurring 238. All elements have isotopes. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Medical definitions for isotope isotope [ ī′sə-tōp′ ] n. One of two or more atoms having the same atomic number but different mass numbers. Other words from isotope i′so•top′ic (-tŏp′ĭk) adj. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for isotope isotope [ ī′sə-tōp′ ] 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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