Which statement best describes alpha particles?

Which statement best describes alpha particles?

• A. They consist of two protons.
• B. They are charged particles, either an electron or a positron.
• C. They are a type of electromagnetic radiation.
• D. They are stable particles.

Answer: (A)

Alpha particles are helium-4 nuclei, meaning they are made of two protons and two neutrons bound together with a +2 charge. They are not electrons or positrons, not a form of electromagnetic radiation, and their nuclear composition is inherently stable. Among the given statements, the one that best matches what alpha particles are is that they are stable particles. Saying they consist of only two protons is incomplete because two neutrons are also part of the alpha particle, which is why that description isn’t fully accurate.

Alpha particles are helium-4 nuclei, meaning they are made of two protons and two neutrons bound together with a +2 charge. They are not electrons or positrons, not a form of electromagnetic radiation, and their nuclear composition is inherently stable. Among the given statements, the one that best matches what alpha particles are is that they are stable particles. Saying they consist of only two protons is incomplete because two neutrons are also part of the alpha particle, which is why that description isn’t fully accurate.