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How may sub-atomic particles are present in an a-particles used in Rutherford's scattering experiment?

1. No. of Protons - 4 No. of Neutrons - 0, No. of Electrons - 0
2. No. of Protons - 2. No. of Neutrons - 0, No. of Electrons - 2
3. No. of Protons - 2 , No. of Neutrons - 2, No. of Electrons - 0
4. No. of Protons - 2 No. of Neutrons - 2, No. of Electrons -

Correct answer: No. of Protons - 2 , No. of Neutrons - 2, No. of Electrons - 0

Solution

An alpha particle is the nucleus of a helium atom. A helium nucleus contains 2 protons and 2 neutrons, and since it is just the nucleus, it has 0 electrons.

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