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During the transformation of the thorium isotope 232
90Th into an isotope of radon (Rn),
a total of three α-particles and two β-particles are emitted. Determine the nucleon number
and proton number of the isotope of radon.
Ok, so a=alpha particles, and the b sign= beta. An Alpha particle is a helium nucleus. A Beta particle is a negative electron. The 'nucleon' number is basically 232 minus 90 I think. Hope this helps x