Radium-226 (²²⁶₈₈Ra) decays by emitting one alpha particle. What are the mass number and atomic number of the daughter nucleus?
Correct answer D. A = 222, Z = 86
Explanation
Alpha emission reduces A by 4 and Z by 2: A = 226 − 4 = 222 and Z = 88 − 2 = 86, which is radon-222.
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