Nuclear equations Knowledge-Based Download PDF

Questions

1. 1.

   The radioisotope potassium-40 can decay through electron capture according to the nuclear equation $^{40}_{19}\text{K} + {}^{0}_{-1}\text{e} \rightarrow \text{Z}$. Which nuclide correctly represents $\text{Z}$?

   • A) $^{40}_{20}\text{Ca}$
   • B) $^{39}_{19}\text{K}$
   • C) $^{40}_{17}\text{Cl}$
   • D) $^{40}_{18}\text{Ar}$
2. 2.

   A radioactive parent nuclide undergoes beta-minus decay to produce iodine-131 according to the nuclear equation $\text{X} \rightarrow {}^{131}_{53}\text{I} + {}^{0}_{-1}\text{e}$. Which nuclide is the parent nucleus $\text{X}$?

   • A) $^{131}_{54}\text{Xe}$
   • B) $^{131}_{52}\text{Te}$
   • C) $^{130}_{53}\text{I}$
   • D) $^{131}_{51}\text{Sb}$
3. 3.

   A uranium-235 nucleus undergoes induced fission according to the nuclear equation $^{235}_{92}\text{U} + ^{1}_{0}\text{n} \rightarrow ^{141}_{56}\text{Ba} + ^{92}_{36}\text{Kr} + x\,^{1}_{0}\text{n}$. What is the integer value of the coefficient $x$ required to balance this equation?

   • A) 1
   • B) 2
   • C) 3
   • D) 4
4. 4.

   Which daughter nuclide correctly completes the alpha decay equation $^{232}_{90}\text{Th} \rightarrow \text{X} + ^{4}_{2}\text{He}$?

   • A) $^{228}_{89}\text{Ac}$
   • B) $^{228}_{88}\text{Ra}$
   • C) $^{232}_{88}\text{Ra}$
   • D) $^{236}_{92}\text{U}$
5. 5.

   In the nuclear reaction $^{14}_{7}\text{N} + ^{4}_{2}\text{He} \rightarrow ^{17}_{8}\text{O} + \text{X}$, what is the identity of the unknown particle represented by $\text{X}$?

   • A) A neutron ($^{1}_{0}\text{n}$)
   • B) A beta particle ($^{0}_{-1}\text{e}$)
   • C) A positron ($^{0}_{+1}\text{e}$)
   • D) A proton ($^{1}_{1}\text{p}$)