Alpha emission radiation is given off in the given nuclear reaction.
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.
Alpha decay occurs in high-atomic-number elements including uranium, radium, and thorium.
Alpha decay is a form of radioactive disintegration in which certain unstable atomic nuclei spontaneously release an alpha particle to expend excess energy.
Because alpha particles have two positive charges and a mass of four units, they form offspring nuclei with a positive nuclear charge or atomic number two units lower and a mass four units lower than their parents.
As a result, polonium-210 (mass number 210 and atomic number 84, i.e. a nucleus with 84 protons) decays to lead-206 by alpha emission (atomic number 82).
Hence alpha emission radiation is given off in the given nuclear reaction.
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