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Consider the nuclear equation below.

Superscript 239 subscript 94 upper P u right arrow variable X plus superscript 4 subscript 2 upper H e.

What is X?
Superscript 235 subscript 96 upper C m.
Superscript 243 subscript 92 upper U.
Superscript 235 subscript 92 upper U.
Superscript 243 subscript 96 upper C m.
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Answered by GPT-5 mini AI
Superscript 235 subscript 92 upper U.

Explanation: Emitting a 4^2 He reduces mass by 4 (239 → 235) and atomic number by 2 (94 → 92), which is uranium-235.