The nuclear equation for the alpha decay of astatine-213 is shown below:
²¹³₈₅At ⇒ ²⁰⁹₈₃X + ⁴₂He
²¹³₈₅At ⇒ ²⁰⁹₈₃Bi + ⁴₂He
This is derived by calculating a and b of the new element.
²¹³₈₅At ⇒ ᵇₐX + ⁴₂He
213 = b + 4
213-4 = b
209 =b
b= 209
85= a+2
85-2 = a
83=a
a=83
The alpha decay of Astatine-213 forms the element known as Bismuth.
Astatine has an atomic number of 85. Alpha decay involves an element
being split into a new element and a Helium ion.
The atomic mass is usually decreased by 4 and the atomic number is usually
decreased by 2 which gives rise to the element Bismuth which is denoted by
²⁰⁹₈₃Bi
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