The thorium nucleus 230 90Th was transformed into the radium nucleus 226 88Ra. What particle was emitted by the thorium nucleus?

In nuclear transformations, the laws of conservation of mass and charge are fulfilled. Thus, the charge of the unknown particle is 90-88 = 2, and the mass is 230-226 = 4. A particle with a mass of 4 and a charge of 2 is a b-particle.
Answer: a-particle

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