Which nucleus is the most stable?



Iron-56 (56Fe) is the most common isotope of iron. About 91.754% of all iron is iron-56. Of all nuclides, iron-56 has the lowest mass per nucleon. With 8.8 MeV binding energy per nucleon, iron-56 is one of the most tightly bound nuclei.


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Iron-56 – Wikipedia

which is the most popular isotope of iron is considered as the most stable nucleus mainly because it has the lowest mass per nucleon of all nuclides. Further, with a binding energy of 8.8 MeV per nucleon, iron-56 is a tightly and efficiently bound nucleus.

Which nucleus is most stable even even?

Stable nuclei generally have even numbers of both protons and neutrons and a neutron-to-proton ratio of at least 1. Nuclei that contain magic numbers of protons and neutrons are often especially stable. Superheavy elements, with atomic numbers near 126, may even be stable enough to exist in nature.

Which nucleus is most stable odd or even?

In nuclear physics, properties of a nucleus depend on evenness or oddness of its atomic number Z, neutron number N and, consequently, of their sum, the mass number A. Most importantly, oddness of both Z and N tends to lower the nuclear binding energy, making odd nuclei generally less stable.

How do you know which nuclei is more stable?

The principal factor for determining whether a nucleus is stable is the neutron to proton ratio. Elements with (Z&lt,20) are lighter and these elements’ nuclei and have a ratio of 1:1 and prefer to have the same amount of protons and neutrons.

Which element has the most stable atomic nucleus?

Specifically, Iron 56 is the most stable nucleus known to man.

Which is the least stable nucleus?

The least stable nucleus is Fe.

A stable atom has enough binding energy to hold the nucleus together permanently. An unstable atom does not have enough binding energy to hold the nucleus together permanently and is called a radioactive atom.

Why is Fe 56 the most stable nucleus?

Iron-56 which is the most popular isotope of iron is considered as the most stable nucleus mainly because it has the lowest mass per nucleon of all nuclides. Further, with a binding energy of 8.8 MeV per nucleon, iron-56 is a tightly and efficiently bound nucleus.

How do you know if a nucleus is unstable?

An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced, if the nucleus has an excess of internal energy. Instability of an atom’s nucleus may result from an excess of either neutrons or protons.

What does the stability of a nucleus depend on?

The stability of an atom depends on the ratio of its protons to its neutrons, as well as on whether it contains a “magic number” of neutrons or protons that would represent closed and filled quantum shells. These quantum shells correspond to energy levels within the shell model of the nucleus.

What is stable nucleus?

Definition. Nuclear stability means that the nucleus of an element is stable and thus it does not decay spontaneously emitting any kind of radioactivity. Among the ≈9,000 nuclei expected to exist, and the ≈3,000 presently known, only 195 are stable against spontaneous decay, because of energy conservation.

Is uranium 238 stable?

All three isotopes are radioactive (i.e., they are radioisotopes), and the most abundant and stable is uranium-238, with a half-life of 4.4683×109 years (close to the age of the Earth).

How many stable nuclei are there?

As of December 2016, there were a total of 252 known “stable” nuclides. In this definition, “stable” means a nuclide that has never been observed to decay against the natural background. Thus, these elements have half lives too long to be measured by any means, direct or indirect.

Which element is most stable?

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable.

What is the highest stable element?

Tin, atomic # 50 has 10 stable isotopes, the highest for any element owing to the “magic” number of protons. In addition, 29 additional unstable isotopes of tin are known to exist.

Is Fe or Ni more stable?

The element becomes more stable as the binding energy per nucleon increases. So from the graph you can see that smaller elements carry out fusion, and larger elements fission, in order to become more stable. We were told that iron is the most stable element, however nickel has a higher binding energy per nucleon.

Which of the following is the least stable?

CH3−CH2−CH2⊕ is 1o carbocation. Hence, it is least stable.

Which of the following nuclides has least stability?

Nuclide having odd numbers of protons and neutrons are generally unstable.

Which is least stable CH3 CH2 CH3 CH3 CH CH3?

(CH3)3C+ i.e 3° carbocation is more stable carbocation than 1° carbocation i.e CH3+ or CH3CH2+ because 3° carbocation has more hyper conjunction effect i.e it has 9 alpha hydrogen which is more stable but CH3+ has 0 aplha hydrogen thats why it is least stable carbocation and CH3CH2+ has 3 alpha hydrogen it is also less …

Which is most stable iron?

Yes, iron or more precisely an isotope of iron know as iron-56 is the most stable element known.

Is carbon stable or unstable?

Carbon-12 is stable, meaning it never undergoes radioactive decay. Carbon-14 is unstable and undergoes radioactive decay with a half-life of about 5,730 years (meaning that half of the material will be gone after 5,730 years).

Why are neutrons stable in the nucleus?

The neutron is an intermediary between the protons, as the discrete forces of the protons are otherwise incompatible. This bond also gives a full complement of discrete forces to the neutron, hence its stability within the nucleus.

Is Neon stable or unstable?

Neon is stable as it has a full octet or valence shell of 8 electrons.

How is the stability of a nucleus related to nuclear energy?

The mass of a 2H atom is less than the sum of the masses of a proton, a neutron, and an electron by 0.002388 amu, the difference in mass corresponds to the nuclear binding energy. The larger the value of the mass defect, the greater the nuclear binding energy and the more stable the nucleus.

Which of the following is most likely a lighter stable nucleus?

Which of the following is most likely a lighter stable nucleus? A lighter stable nucleus usually has a neutron:proton ratio close to 1. They are known as radioisotopes. They undergo nuclear decay.

Which radioisotope is most stable?

The most stable isotope of uranium, U-238, has an atomic number of 92 (protons) and an atomic weight of 238 (92 protons plus 146 neutrons). The isotope of uranium of greatest importance in atomic bombs, U-235, though, has three fewer neutrons.

Which elements have a stable nucleus?


Z Element Stable
46 palladium 6
68 erbium 6
20 calcium 5
34 selenium 5

Why is uranium nucleus unstable?

Although they are tiny, atoms have a large amount of energy holding their nuclei together. … During fission, U-235 atoms absorb loose neutrons. This causes U-235 to become unstable and split into two light atoms called fission products.

Why is U-238 more stable than U-235?

U-238 is the most abundant uranium followed by U-U- 235 and 234. The difference between the three isotopes is the number of neutrons present in the nucleus. U-238 has 4 more neutrons than U-234 and three more neutrons than U-235. U-238 is more stable thus being more abundant naturally.

Is Boron 10 stable or unstable?

Boron 10 Metal (Boron-10) is a stable (non-radioactive) isotope of Boron. It is both naturally occurring and a produced by fission.

Which is the most unstable element?

Characteristics. Francium is one of the most unstable of the naturally occurring elements: its longest-lived isotope, francium-223, has a half-life of only 22 minutes.

What is an example of a stable nucleus?

For example, helium-4 is among the most abundant (and stable) nuclei in the universe. The stable elements at the end of the decay series all have a “magic number” of neutrons or protons.

Is lead the most stable element?

Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements.

What are the two most stable elements?

The noble gases are the most stable elements chemically with Helium being even more stable than the others.

What is the most stable molecule?

Al2O3, the Aluminium Trioxide. It has a Standard Gibbs Free Energy of Formation value of -1582.275, the lowest of all other componds ones, meaning precisely more stability. Among all the crystalline forms of the compound, the alpha-alumina (corundum) is the most stable.

Why is Fe more stable than Co and Ni?

Fe3+ ion is more stable due to its half-filled 3d5 electron configuration. As half filled and completely filled shells are more stable Fe3+ ion is more stable.