Final answer:
Polonium-210 decays into Lead-206 by emitting an alpha particle, represented by the equation _{84}^{210}Po -> _{82}^{206}Pb + _{2}^{4}He.
Step-by-step explanation:
The radioactive decay of Polonium-210 to Lead-206 involves the emission of an alpha particle. The nuclear equation for this decay process is as follows:
_{84}^{210}Po \rightarrow _{82}^{206}Pb + _{2}^{4}He
An alpha particle is represented by the symbol _{2}^{4}He, and it consists of 2 protons and 2 neutrons. When a nucleus emits an alpha particle, its atomic number decreases by 2 (from 84 to 82), and its mass number decreases by 4 (from 210 to 206). This is how Polonium-210 decays into Lead-206.