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Positives repel each other. In an atom, the nucleas is full repelling protons with their positive charge. It is the nuclear force that holds them together in the nucleus. A Helium atom has only 2 protons which makes it more stable.

Uranium on the other hand, has 92 protons all squashed together. This makes it very unstable which allows it to undergo gamma radiation.

That is why Uranium is radioactive.
Unstable atoms as uranium are radioactive; the stability depends on the ratio between protons and neutrons.

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14y ago

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