Hence the radioactivity is associated with unstable nucleus. Nuclides with odd number of protons and neutrons are the least stable infers more radioactive. Nuclides with even numbers of both protons and neutrons are most stable infers less radioactive.
Which of the following nuclear is least stable?
Nuclides containing odd numbers of both protons and neutrons
are the least stable and this means more radioactive. Nuclides containing even numbers of both protons and neutrons are most stable and this means less radioactive. than nuclides containing even numbers of protons and odd numbers of neutrons.
Is helium the least stable nucleus?
Helium-2 (diproton)
is an
extremely unstable
isotope of helium. Its nucleus, a diproton, consists of two protons with no neutrons. According to theoretical calculations, it would have been much more stable (although still undergoing β
+
decay to deuterium) if the strong force had been 2% greater.
Which nucleus is unstable?
In unstable nuclei the strong nuclear forces do not generate enough binding energy to hold the nucleus together permanently. It is unstable nuclei that are radioactive and are referred to as
radioactive nuclei
and in the case of their isotopes called radioisotopes.
What makes a nucleus less stable?
Too many protons (or too few neutrons) in the nucleus
result in an imbalance between forces, which leads to nuclear instability. Figure 21.2. 1: Competing Interactions within the Atomic Nucleus. Electrostatic repulsions between positively charged protons would normally cause the nuclei of atoms (except H) to fly apart.
What is the most stable element?
There are some 90+ elements of the periodic table that occur naturally in the Universe, but of them all,
iron
is the most stable. If you fuse lighter elements together to get closer to iron, you gain energy; the same is true if you split heavier elements apart.
Which nucleus is most stable?
It is a stable isotope, with the highest binding energy per nucleon of any known nuclide (8.7945 MeV). It is often stated that
56
Fe
is the “most stable nucleus”, but only because
56
Fe has the lowest mass per nucleon (not binding energy per nucleon) of all nuclides.
How do you know if a nucleus is stable?
The two main factors that determine nuclear stability are
the neutron/proton ratio and the total number of nucleons in the nucleus
. The principal factor for determining whether a nucleus is stable is the neutron to proton ratio.
What happens when two nuclei fuse?
In fusion reactions, two light atomic nuclei
fuse together to form a heavier nucleus and release a large amount of energy
. The basic concept behind any fusion reaction is to bring two light nuclei close enough so the residual strong force (nuclear force) in their nuclei will pull them together.
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.
Why are some nuclei radioactive?
Why some elements are radioactive (unstable).
When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable
. Whether radioactive elements can become stable and if so, how. The unstable nucleus of radioactive atoms emit radiation.
Why are isotopes unstable?
Usually, what makes an isotope unstable is the large nucleus.
If a nucleus becomes larger enough from the number of neutrons, since the neutron count is what makes isotopes
, it will be unstable and will try to ‘shed’ its neutrons and/or protons in order to achieve stability.
What radioisotope is the most stable?
| Element Most Stable Isotope Half-life of Most Stable Isotope | Oganesson Og-294 1.8 milliseconds |
|---|
What does a stable nucleus mean?
Nuclear stability means that the
nucleus of an element is stable
and thus it does not decay spontaneously emitting any kind of radioactivity. … Those nuclei with the highest binding energy per nucleon are the most stable with respect to destructive nuclear reactions.
Why are very heavy nuclei unstable?
The
presence of too many protons and neutrons in heavier nuclei will upset the balance and binding energy of nuclear force
, which make the nucleus unstable. Such an unstable nucleus achieves the balance by giving off the neutron and proton via radioactive decay.
How atomic nucleus is stable?
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.
