Radioactive substances do not emit

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(D) Radioactive decay is the process by which a nucleus of an unstable atom loses energy by emitting radiation.Alpha decay involves the emission of an

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Proton

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(D) Radioactive decay is the process by which a nucleus of an unstable atom loses energy by emitting radiation.Alpha decay involves the emission of an alpha particle,which is a helium nucleus $(He^{2+})$.Beta decay involves the emission of an electron $(e^-)$ or a positron $(e^+)$ along with a neutrino or antineutrino.While some rare forms of decay like proton emission exist in highly unstable synthetic isotopes,protons are not considered standard emissions from naturally occurring radioactive substances in the context of typical nuclear decay processes.

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