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The symbol for an alpha particle is 24He2+. The first 2 means that there are 2 protons. The second 2+ means that the net charge is +2, which means, since there are 2 protons, that there are no electrons. The result is that an alpha particle is a helium nucleus without its electrons, i.e. 2 protons and 2 neutrons, but no electrons.

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