The type of decay which thallium (TI) experiences in the given nuclear reaction is an: D. alpha decay.
What is an alpha decay?
An alpha decay refers to a type of nuclear reaction in which the atomic nucleus of a radioactive element such as thallium (TI), emits an alpha particle (helium atom), thereby, producing chemical elements with a different atomic nucleus.
In this exercise, we can infer and logically deduce that the type of decay which thallium (TI) experiences in the given nuclear reaction is an alpha decay because it produces an alpha particle (helium atom) i.e ⁴He₂.
Read more on alpha decay here: brainly.com/question/23303931
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