The nucleus that completes the equation is the Polonium-208 nucleus.
What is a nuclear reaction?
A nuclear reaction is a reaction in which the nucleus undergoes changes to their composition releasing energy and heat.
The nuclear reaction given is as follows:
[tex]^{212}_{86}Rn \rightarrow ^{4}_{2}He + ^{208}_{84}Po[/tex]
Therefore, the nucleus that completes the equation is the Polonium-208 nucleus.
Leran more about nuclear reactions at: https://brainly.com/question/1272441
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