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`._(92)U^(238)` से `6 alpha` तथा `4beta` कणों के उत्सर्जन से प्राप्त तत्व का परमाणु क्रमांक व द्रव्यमान संख्या ज्ञात कीजिए।

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माना अन्‍तिम प्राप्त तत्व `._(z)X^(A)` हैं अतः
`._(92)U^(238)togt_(Z)X^(A)+5(._(2)He^(4))+4(._(-1)e^(0))`
दोनों ओर के परमाणु क्रमांक बराबर करने पर
`92=Z+6(2)+4(-1)=Z+8`
अथवा `Z=92-8=84`
दोनों ओर की द्रव्यमान संख्या बराबर करने पर,
`238=A+6(4)+4(0)`
अथवा `A=238-24=214`

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