# Thorium-234 Decay: Positron & Alpha

Chemistry Level 2

$_{90}^{234}Th + _{+1}^{\space 0}e \rightarrow X \\ X \rightarrow _2^4He + Y$ $$\text{Thorium-234}$$ undergoes positron absorption to form atom $$\text{X}$$, which then undergoes $$\alpha$$ decay to form an alpha particle and atom $$\text{Y}$$.  Determine the identity of $$\text{Y}$$ and give your answer as the $$\text{mass number}$$ minus the $$\text{atomic number}$$.

David's Organic Chemistry Set

David's Physical Chemistry Set

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