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α-particle consists of :

(1) 2 protons and 2 neutrons only

(2) 2 electrons, 2 protons and 2 neutrons

(3) 2 electrons and 4 protons only

(4) 2 protons only
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Atoms, alpha particle and Rutherford model

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Ans: (1) 2 protons and 2 neutrons only

Sol: Alpha particle is nucleus of He which contains 2 protons and 2 neutrons.

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