nuclide


nuclide
/nooh"kluyd, nyooh"-/, n. Physics.
1. an atomic species in which the atoms all have the same atomic number and mass number.
2. an individual atom in such a species.
[1945-50; NUCL(EO)- + -ide < Gk eîdos shape]

* * *

or nuclear species

Species of atom as characterized by the number of protons, neutrons, and the energy state of the nucleus.

A nuclide is characterized by its mass number and its atomic number. To be regarded as distinct, a nuclide must have an energy content sufficient for a measurable lifetime, usually more than 10-10 second. Nuclear isomers, which have the same number of protons and neutrons but differ in energy content and radioactivity, are also distinct nuclides. Nuclides are associated with radioactive decay and may be stable or unstable. There are about 1,700 known nuclides, of which about 300 are stable and the rest radioactive.

* * *

also called  nuclear species,  

      species of atom as characterized by the number of protons, the number of neutrons, and the energy state of the nucleus. A nuclide is thus characterized by the mass number (A) and the atomic number (Z). To be regarded as distinct a nuclide must have an energy content sufficient for a measurable lifetime, usually more than 10−10 second. The term nuclide is not synonymous with isotope, which is any member of a set of nuclides having the same atomic number but differing mass number.

      Chlorine-37, the nucleus of which consists of 17 protons and 20 neutrons, is a different nuclide from sodium-23 (nucleus of 11 protons and 12 neutrons) or chlorine-35 (nucleus of 17 protons and 18 neutrons). Nuclear isomers (isomer), which have the same number of protons and neutrons but differ in energy content and radioactivity, are also distinct nuclides.

      Nuclides are commonly expressed in the form A/ZX, where A denotes the total number of protons and neutrons, Z represents the number of protons, and the difference between A and Z is the number of neutrons. Thus 37/17Cl signifies chlorine-37.

      Nuclides are associated with radioactive decay and may be stable or unstable species. About 1,700 nuclides are known, of which about 300 are stable and the rest radioactive. More than 200 of the stable nuclides were discovered by the British physicist Francis William Aston using his new invention of the mass spectrograph.

* * *


Universalium. 2010.

Look at other dictionaries:

  • NUCLIDE — On appelle nuclides, ou espèces nucléaires, l’ensemble des noyaux de tous les isotopes des éléments chimiques. Les isotopes d’un élément étant caractérisés par le même nombre atomique Z et possédant un nombre variable N de neutrons, tels que Z +… …   Encyclopédie Universelle

  • nuclide — nuclide. См. нуклид. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Nuclide — См. Нуклид Термины атомной энергетики. Концерн Росэнергоатом, 2010 …   Термины атомной энергетики

  • nuclide — (n.) 1947, from NUCLEUS (Cf. nucleus) + IDE (Cf. ide) …   Etymology dictionary

  • nuclide — [no͞o′klīd΄, nyo͞o′klīd΄] n. [< NUCLEUS + ide < Gr eidos, form: see OID] a specific type of atom that is characterized by its nuclear properties, such as the number of neutrons and protons and the energy state of its nucleus nuclidic adj …   English World dictionary

  • Nuclide — A nuclide (from nucleus) is an atomic species characterized by the specific constitution of its nucleus, i.e., by its number of protons Z, its number of neutrons N, and its energy state.[1] Thus, all nuclides are atoms that have at least one… …   Wikipedia

  • nuclide — nuklidas statusas T sritis Energetika apibrėžtis Atomas, apibūdinamas jo masės skaičiumi, atominiu numeriu ir branduolinės energijos padėtimi, nusakoma pakankama tai padėčiai ištirti gyvavimo trukme. atitikmenys: angl. nuclide vok. Nuklid, n rus …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • nuclide — nuklidas statusas T sritis chemija apibrėžtis Elemento atomas, kuris nuo kito atomo skiriasi protonų arba neutronų (arba ir vienų, ir kitų) skaičiumi branduolyje. atitikmenys: angl. nuclide rus. нуклид …   Chemijos terminų aiškinamasis žodynas

  • nuclide — nuklidas statusas T sritis fizika atitikmenys: angl. nuclide vok. Nuklid, n rus. нуклид, m pranc. nucléide, m …   Fizikos terminų žodynas

  • nuclide — noun Etymology: nucleus + Greek eidos form, species more at idol Date: 1947 a species of atom characterized by the constitution of its nucleus and hence by the number of protons, the number of neutrons, and the energy content • nuclidic adjective …   New Collegiate Dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.