A) Periodic table
B) Hubble's expansion evidence
C) Periodic comet prediction
D) Radioactivity
Answer: D
Explanation: Radioactivity means spontaneous nuclear emissions first reported by Henri Becquerel. His uranium-salt work was pivotal.
A) Periodic table
B) Hubble's expansion evidence
C) Periodic comet prediction
D) Radioactivity
Answer: D
Explanation: Radioactivity means spontaneous nuclear emissions first reported by Henri Becquerel. His uranium-salt work was pivotal.
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