What is an alpha particle?

A helium nucleus with two protons and two neutrons.

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  1. A high-energy photon
  2. A fast electron from the nucleus
  3. A helium nucleus with two protons and two neutrons ✔

Why: An alpha particle is a helium nucleus emitted in alpha decay, containing two protons and two neutrons.

Huh, didn't know that: An alpha particle is a helium nucleus emitted in alpha decay, containing two protons and two neutrons.

The dad joke
Alpha particles are helium nuclei on the move.
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References

Answer: A helium nucleus with two protons and two neutrons. An alpha particle is a helium nucleus emitted in alpha decay, containing two protons and two neutrons.

  1. Nuclear physics en.wikipedia.org/wiki/Nuclear_physics
    emitting a helium nucleus (2 protons and 2 neutrons)
    Checked 2026-11-07.

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