Alpha particles are essentially the nuclei of helium atoms. Here's a breakdown of their structure:

* Composition:

* 2 protons: These give the alpha particle a +2 charge.

* 2 neutrons: These contribute to the mass of the alpha particle.

* Symbol: Alpha particles are often represented by the symbol α.

* Charge: +2 (due to the two protons)

* Mass: Approximately 4 atomic mass units (amu), which is roughly the mass of a helium nucleus.

Important Note: Alpha particles are emitted during certain types of radioactive decay, known as alpha decay. They are relatively heavy and slow-moving compared to other types of radiation like beta particles or gamma rays.