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Nuclei

Atomic masses and composition of Nucleus

  • It is the strong force of attraction which holds together the nucleons (neutrons and protons) in the nucleus of an atom, in spite of strong electrostatic forces of repulsion between protons.

Characteristics:

  • They do not depend on the electric charge.

  • They are the strongest forces in nature.

  • They are very short range forces.

  • Nuclear force is negligible when distance between nucleons is more than 10 Fermi. Attraction develops when brought closer. However, when the distance between them is less than 0.8 Fermi, they repel strongly.

An atom is composed of electrons, protons and neutrons. The protons and neutrons reside inside the nucleus of the atom which is at its centre, while the electrons revolve around the nucleus in some specific orbits, called stationary orbits or stationary shells, in which they do not radiate out energy.

The maximum number of electrons in an orbit can be 2n2, where n is the number of that orb…

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