Physics for IGCSE & O level - Atoms And Radioactivity (Section 4 - No. 45)
How many protons and neutrons are in an alpha particle?
1 proton and 1 neutron
2 protons and 2 neutrons
1 proton and 2 neutrons
2 protons and 1 neutron
Explanation
An alpha particle is a helium nucleus with 2 protons and 2 neutrons.
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