In the Uranium radioactive series, the initial nucleus is ( ₉₂²³⁸ U ) and final nucleus is ( ₈₂²⁰⁶ ~Pb ). When the Uranium nucleus decays to lead, the number of ( )-particles emitted is .......... and the number of ( )-particles emitted is ____.

Step-by-step solution

According to question, Initial nuclei (= ₉₂²³⁸ U ) Final nuclei (= ₈₂²⁰⁶ ~Pb ) Change in atomic number (=92-82=10 ) When an ( )-particle emits from a nuclei, then its atomic number is decreased by 2 units and atomic mass is decreased by 4 units. When a ( )-particle emits from a nuclei, then atomic number of parent nuclei is increased by 1 unit whereas its atomic mass remains same. Change in atomic mass (=238-206=32 ) Since, atomic mass changes only due to emission ( )-particle, hence number of emitted ( )-particle