Nuclear Force

What is Nuclear Force?

A force that binds nucleons (a combination of protons and electrically neutral particles i.e., neutrons) together within the nucleus is known as Nuclear Force. It is one of the fundamental forces of nature like gravitational and electromagnetic forces.

The nuclear force is also known as Strong Force.


A nucleus is made of neutrons and protons and the charge of protons corresponds to the positive charge in the nucleus. In the earlier theories, it was proposed that a nucleus may have some electrons along with protons and neutrons. However, when based on the arguments proposed by quantum theory the presence of electrons in the nucleus of the atom was ruled out as all electrons are present outside the nucleus.

Basically, the atomic number of an atom corresponds to the number of electrons existing outside the nucleus of the atom.

You must note there that an atom is neutral thus if the atomic number is denoted by Z so, -Ze represents the total charge of atomic electrons while +Ze is the charge of nucleus due to protons.

What is Proton?

Proton is a stable subatomic particle. For proton, it is said that one single proton holds one unit of positive fundamental charge. It is said that the magnitude of unit positive charge is equal to the magnitude to the unit negative charge.

The combination of protons along with neutrons results in atomic nuclei. However, there is an exception where the hydrogen nucleus has only a single proton.

You must note here that there is same number of protons present in every nucleus of a chemical element.

What is Neutron?

Neutron is a neutral subatomic particle present in every atomic nucleus but the exception is hydrogen because its nucleus has only protons. It is an uncharged particle and symbolized as n.

Despite its neutral behaviour, neutron acts as an important research tool, as the structure of a general matter can be easily understood with the help of idea about the properties and structure of the neutrons.

A free-electron i.e., the one which is not bounded within the nucleus results in beta decay which is a type of radioactive decay.

Concept of Nuclear Force

We know that neutrons and protons constitute the nucleus. As protons possess positive charge so protons show repulsion towards each other due to Coulomb’s Law. Thus, to bind the nucleus together a strong attractive force is required. This binding force must be strong enough so that it can overcome the repulsion existing between positively charged particle i.e., protons. This facilitates binding of the protons and neutrons together into a small nuclear volume.nucleus

The nuclear force is attractive in nature and this powerful attractive force exist at around 1 femtometer distance.

As we know that to bring the charged protons together against the electric repulsion existing between them requires energy. So, when protons and neutrons are bound together by the nuclear force then this energy is stored and is used in nuclear power and nuclear weapons.

Properties of Nuclear Force

  1. The nuclear force is strongly attractive, short-range force explaining nuclear binding.
  2. The nuclear force existing between two nucleons decays to zero when their separation distance exceeds few femtometers. Thus, for the large-sized nucleus, there will be a saturation of forces.
  3. The nuclear force is very strong in comparison to Coulomb’s force or Gravitational force. Basically, this force must be stronger than Coulomb’s force so that it can dominate the repulsive force existing between the protons within the nucleus.
  4. The nuclear force is independent of charge thus is approximately same for two neutrons, 1 proton and 1 neutron, 2 protons.

You must note here that there exists no simple mathematical formula for a nuclear force as we have in case of Coulomb’s law or Newton’s law of Gravitation.

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5 thoughts on “Nuclear Force

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