1.

Geiger and Marsden's experiment, which established the nuclear model of the atom, used a beam of :

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`BETA-`particles, which impinged on a metal foil and got absorbed
`GAMMA` rays, which impinged on a metal foil and EJECTED electrons
hydrogen atoms, which impinged on a metal foil and got scattered
helium nuclei, which impinged on a metal foil and got scattered

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