Why are alpha particles emitted?

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Solution

Alpha particles:
Alpha particles are particles that consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.
Representation of alpha particle
$α \to {}_{2}^{4}{He}$
Emission of alpha particles:
The nuclei whose n/p ratio lies above the stability belt are unstable and are radioactive.
These radioactive elements emit the alpha and beta particles to form stable nuclei and this process is known as radioactivity.
Generally, the high atomic number elements like Uranium(U), Radium(Ra), and Thorium(Th) undergo alpha decay.

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