Neutron number

Nnumber of neutronsneutron excess
The neutron number, symbol N, is the number of neutrons in a nuclide.wikipedia
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Neutron

neutronsfree neutronn
The neutron number, symbol N, is the number of neutrons in a nuclide.
The chemical and nuclear properties of the nucleus are determined by the number of protons, called the atomic number, and the number of neutrons, called the neutron number.

Atomic number

proton numberZatomic numbers
Atomic number (proton number) plus neutron number equals mass number: Z + N = A.
The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.

Isotope

isotopesisotopicisotopic composition
This word was formed by replacing the p in isotope with n for neutron.
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.

Isotone

isotonic
Nuclides that have the same neutron number but a different proton number are called isotones.
Two nuclides are isotones if they have the same neutron number N, but different proton number Z.

Mass number

atomic mass numbernucleon numberA
Atomic number (proton number) plus neutron number equals mass number: Z + N = A.
Hence, the difference between the mass number and the atomic number Z gives the number of neutrons (N) in a given nucleus: N = A - Z.

Nuclide

nuclidesIsodiaphernuclear species
The neutron number, symbol N, is the number of neutrons in a nuclide.
A set of nuclides with equal proton number (atomic number), i.e., of the same chemical element but different neutron numbers, are called isotopes of the element.

Fissile material

fissilefissionablefissile isotope
For example, actinides with odd neutron number are usually fissile (fissionable with slow neutrons) while actinides with even neutron number are usually not fissile (but are fissionable with fast neutrons).
According to the Ronen fissile rule, for a heavy element with 90 ≤ Z ≤ 100, its isotopes with 2 × Z − N = 43 ± 2, with few exceptions, are fissile (where N = number of neutrons and Z = number of protons).

Subscript and superscript

superscriptsubscriptsuperscripts
Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol.

Isobar (nuclide)

isobarisobarsisobaric
Nuclides that have the same mass number are called isobars.

Chemical element

elementelementschemical elements
Chemical properties are primarily determined by proton number, which determines which chemical element the nuclide is a member of; neutron number has only a slight influence.

Isotopomers

isotopomerisotopic isomera slight influence
Chemical properties are primarily determined by proton number, which determines which chemical element the nuclide is a member of; neutron number has only a slight influence.

Actinide

actinidesactinide seriesactinoid
For example, actinides with odd neutron number are usually fissile (fissionable with slow neutrons) while actinides with even neutron number are usually not fissile (but are fissionable with fast neutrons).

Neutron temperature

thermal neutronfast neutronthermal neutrons
For example, actinides with odd neutron number are usually fissile (fissionable with slow neutrons) while actinides with even neutron number are usually not fissile (but are fissionable with fast neutrons).

List of elements by stability of isotopes

stable elementat least one stable isotopecertain elements
No odd-neutron-number isotope is the most naturally abundant isotope in its element, except for beryllium-9 which is the only stable beryllium isotope, nitrogen-14, and platinum-195.

Beryllium

Be 7 BeBerillium
No odd-neutron-number isotope is the most naturally abundant isotope in its element, except for beryllium-9 which is the only stable beryllium isotope, nitrogen-14, and platinum-195.

Isotopes of nitrogen

nitrogen-14 15 Nnitrogen-15
No odd-neutron-number isotope is the most naturally abundant isotope in its element, except for beryllium-9 which is the only stable beryllium isotope, nitrogen-14, and platinum-195.

Platinum

Ptcompounds of platinumdouble Platinum
No odd-neutron-number isotope is the most naturally abundant isotope in its element, except for beryllium-9 which is the only stable beryllium isotope, nitrogen-14, and platinum-195.

Primordial nuclide

primordialprimordial isotopeprimordial element
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Magic number (physics)

magic numbermagic numbersdoubly magic
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Isotopes of barium

barium-140barium-130barium-137
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Isotopes of lanthanum

lanthanum-140lanthanum-138Lanthanum-139
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Isotopes of cerium

cerium-144cerium-140 144 Ce
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Isotopes of praseodymium

Praseodymium-141 141 Pr 143 Pr
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Isotopes of neodymium

neodymium-150Neodymium-142 143 Nd
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.

Isotopes of samarium

samarium-151samarium-149 151 Sm
There are 6 stable nuclides and one radioactive primordial nuclide with neutron number 82 (82 is the neutron number with the most stable nuclides, since it is a magic number): barium-138, lanthanum-139, cerium-140, praseodymium-141, neodymium-142, and samarium-144, as well as the radioactive primordial nuclide xenon-136.