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Definition of Isotope

Babylon English

form of a chemical element which has the same atomic number as the other forms but a different atomic weight (Chemistry)
Isotope Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

isotope
n : one of two or more atoms with the same atomic number but with different numbers of neutrons

WordNet 2.0

Noun
1. one of two or more atoms with the same atomic number but with different numbers of neutrons
(hypernym) atom
(hyponym) radioisotope
Isotope Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
Compare with isomer , allotrope , isobar , and isotone .Atoms or ions of an element with different numbers of neutrons in their atomic nucleus . Isotopes have the same atomic number but different mass number . Isotopes have very similar chemical properties but sometimes differ greatly in nuclear stability.
NRC Nuclear Energy Glossary
Any two or more forms of an element having identical or very closely related chemical properties and the same atomic number but different atomic weights or mass numbers.
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).
ASTRONOMY UNBOUND
One of two (or more) atoms of the same element which only differ in the number of neutrons found within the atomic nucleus ; e.g. 1H , 2D and 3T .
Solar Physics Glossary
One of two or more atoms having the same number of protons in its nucleus , but a different number of neutrons and, therefore, a different mass.
Isotope Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Isotopes are variants of a particular chemical element such that, while all isotopes of a given element have the same number of protons in each atom, they differ in  neutron number. The term isotope is formed from the Greek roots isos ( "equal") and topos ( "place"), meaning "the same place". Thus, different isotopes of a single element occupy the same position on the periodic table. The number of protons within the atom's nucleus is called atomic number and is equal to the number of  electrons in the neutral (un-ionized) atom. Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.

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Isotope Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
A variation of an element that has the same atomic number of protons but a different weight because of the number of neutrons. Various isotopes of the same element may have different radioactive behaviors, some are highly unstable..
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
A variation of an element that has the same atomic number of protons but a different weight because of the number of neutrons. Various isotopes of the same element may have different radioactive behaviors, some are highly unstable..
Isotope Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
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Isotope Definition from Religion & Spirituality Dictionaries & Glossaries
Webart Magic Astronomical Glossary
One of two or more atoms having the same number of protons in its nucleus, but a different number of neutrons and, therefore, a different mass.
Isotope Definition from Medicine Dictionaries & Glossaries
CDC Radiological Terms
 a nuclide of an element having the same number of protons but a different number of neutrons.
  
Source: Centers for Disease Control and Prevention (CDC) ( About )
Dictionary of Medicine (Shahram)
A form of a chemical element with a different atomic mass. Isotopes are used in a number of medical tests.