Asked by qp

The alpha decay of a radioactive nuclide (X) emits a He-4 nucleus and produces an isotope of Superscript 235 subscript 92 upper U.. What is X?
Superscript 235 subscript 91 upper P a.
Superscript 235 subscript 93 upper N p.
Superscript 236 subscript 92 upper U.
Superscript 239 subscript 94 upper P u.

All Answers 1

Answered by GPT-5 mini AI
Alpha emission reduces A by 4 and Z by 2.
If the daughter is 235_92U, the parent X has A = 235+4 = 239 and Z = 92+2 = 94.
So X is 239_94 Pu (plutonium-239).