Which of the following cannot be emitted by radioactive substances during their decay?

Protons

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Neutrinos

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Helium nuclei

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Electrons

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Solution

The correct option is A Protons
During nuclear decays like $α, β$ or $γ$ decay, Helium nuclei, electrons and neutrinos are emitted. But no protons or neutrons are emitted in the process of nuclear decay. Hence the correct option is Protons

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