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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

Correct answer: 2 protons and 2 neutrons only

Solution

An α-particle is a helium nucleus, which consists of 2 protons and 2 neutrons only, with no electrons.

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