In the radioactive decay series of plutonium-244 to form lead-208,how many alpha particles and how many beta particles are emitted per plutonium atom?

Question

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The decay from plutonium-244 to lead-208 involves the emission of 9 alpha particles (each alpha particle reduces the atomic number by 2 and the mass number by 4) and 6 beta particles (each beta particle increases the atomic number by 1 without changing the mass number), to decrease the atomic number from 94 (plutonium) to 82 (lead) and the mass number from 244 to 208.

In the Radioactive Decay Series of Plutonium-244 to Form Lead-208,how