What is an alpha particle made up of?

Rutherford’s alpha-particle scattering experiment was responsible for the discovery of (a) Atomic Nucleus (b) Electron (c) Proton (d) Neutron. Solution : 30. (a) Atomic nucleus (In the alpha-particle scattering experiment that was conducted, when alpha particle approached sufficiently close to the nucleus, it was repelled strongly enough to rebound at high angles which was responsible for the conclusion of Atomic Nucleus)

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