When radium-226 decays to form radon-222,alpha decay is occurred. The atomic number of the radium is too high.
What is alpha decay?
Alpha decay is a form of radioactive disintegration in which certain unstable atomic nuclei spontaneously release an alpha particle to expend excess energy.
Alpha decay occurs in high-atomic-number elements including uranium, radium, and thorium.
Alpha decay occurs in high-atomic-number elements including uranium, radium, and thorium.
When the nucleus of an atom becomes unstable the ratio of neutrons to protons is too low, alpha particles are released to bring the atom back into equilibrium.
When radium-226 decays to form radon-222,alpha decay is occurred.
To learn more about the alpha emission radiation, refer to the link;
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