Alpha particles are best described as?

Alpha particles are best described as?

• A. Negatively charged particles
• B. Positively charged particles
• C. Electrically neutral particles
• D. They have no charge and are photons

Answer: (B)

Alpha particles are positively charged helium nuclei: they are made of two protons and two neutrons, giving them a net charge of +2e. That positive charge is what makes them interact strongly with electric and magnetic fields and with matter as they pass through—causing dense ionization along their path. They’re not negatively charged like electrons, nor electrically neutral like neutrons or gamma rays, and they are not photons, which are massless quanta of light with no charge. Their relatively large mass and double positive charge explain both their short range in materials and their characteristic ionization pattern.

Alpha particles are positively charged helium nuclei: they are made of two protons and two neutrons, giving them a net charge of +2e. That positive charge is what makes them interact strongly with electric and magnetic fields and with matter as they pass through—causing dense ionization along their path. They’re not negatively charged like electrons, nor electrically neutral like neutrons or gamma rays, and they are not photons, which are massless quanta of light with no charge. Their relatively large mass and double positive charge explain both their short range in materials and their characteristic ionization pattern.