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  3. Chemistry
  4. The phenomenon of radioactivity was discovered by:

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Q. The phenomenon of radioactivity was discovered by:

ManipalManipal 2004

Solution:

The protons and neutrons in the unstable nucleus regroup to give the new nucleons of another element.
This causes the release of excess particles and energy from the original nucleus, which we call radiation. The elements whose atomic nucleus emits radiation are said to be radioactive. The spontaneous phenomenon is called radio-activity. It was first discovered by Henry Becquerral in $1896$, while working with Uranium.