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Question

What does an alpha particle represent in the process of alpha decay?

This question was previously asked in
SSC CGL 2025 Tier 1 Question Paper (25-Sep-2025) (Shift 3)
The correct answer is
Helium

Alpha Particle Composition in Alpha Decay

In nuclear physics, alpha decay is a type of radioactive decay where an unstable atomic nucleus loses an alpha particle.

An alpha particle is fundamentally identical to a helium nucleus. It is composed of:

  • 2 protons
  • 2 neutrons

This composition means an alpha particle has an atomic number (Z) of 2 and a mass number (A) of 4. It is often represented in nuclear reactions as $^4_2\text{He}^{2+}$ or simply $\alpha$. This Helium nucleus representation is standard in describing alpha decay processes.

Therefore, the alpha particle represents a Helium nucleus.

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Similar Questions

  1. Which nuclear decay alters atomic number but not mass?
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  5. Which radioactive isotope has a half - life of 5770 years, which is commonly used to estimate the age of organic materials such as paper and parchment?

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