TERMIUM Plus®

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NUCLEON NUMBER [1 record]

Record 1 2011-12-20

English

Subject field(s)
  • Chemistry
  • Atomic Physics
CONT

The mass number of an atom is the total number of its nuclear constituents, or nucleons, as the protons and neutrons are collectively called.

OBS

Because of the approximate equality of the proton and neutron masses, and the relative insignificance of that of the electron, the mass number gives a useful rough figure for the atomic mass ...

French

Domaine(s)
  • Chimie
  • Physique atomique
CONT

En chimie nucléaire, le concept traditionnel d'éléments chimiques cède la place à celui de nuclide ou d'espèce isotopique. [...] Protons et neutrons s'appellent également nucléons; le nombre total de nucléons d'un noyau donne le nombre de masse de ce noyau.

OBS

Le nombre de masse exprime à peu près la masse du noyau en unité de masse nucléonique mais il ne faut pas confondre les deux termes «nombre de masse» et «masse atomique».

Spanish

Campo(s) temático(s)
  • Química
  • Física atómica
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