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When radium-226 decays to form radon-222, the radium nucleus emits a(an)

A. alpha particle.

B. beta particle.

C. gamma ray.

D. electron.

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taskmasters
I believe the correct answer from the choices listed above is option A. When radium-226 decays to form radon-222, the radium nucleus emits an  alpha particle. Alpha decay is a radioactive process in which a particle with two neutrons and two protons is ejected from the nucleus of a radioactive atom.

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