Question 1

Which of the following correctly describes electron capture in a nuclear reaction?

Accepted Answer

A nucleus absorbs an electron from the inner shell, decreasing its atomic number by one.

Question 2

What is the balanced nuclear equation for the electron capture of $^{125}_{53}I$?

Accepted Answer

$^{125}_{53}I + ^{0}_{-1}e \rightarrow ^{125}_{52}Te$

Question 3

During positron emission, what happens to the atomic number and mass number of the parent nucleus?

Accepted Answer

Atomic number decreases by one; mass number remains unchanged.

Question 4

Which particle is emitted during positron emission?

Accepted Answer

$^{0}_{+1}e$

Question 5

Given the nuclear reaction $^{229}_{87}Fr \rightarrow ^{225}_{85}At + ^{4}_{2}He$, what type of decay has occurred?

Accepted Answer

Alpha decay

Question 6

A radioactive isotope of cesium, $^{135}_{55}Cs$, undergoes positron emission. What is the product nucleus?

Accepted Answer

$^{135}_{54}Xe$

Question 7

Which of the following correctly represents the positron emission of $^{22}_{11}Na$?

Accepted Answer

$^{22}_{11}Na \rightarrow ^{22}_{10}Ne + ^{0}_{+1}e$

Question 8

If $^{215}_{86}Rn$ undergoes two alpha decays and one positron emission, what is the resulting daughter nucleus?

Accepted Answer

$^{207}_{84}Po$

Question 9

Which of the following is true about the mass number and atomic number changes during electron capture?

Accepted Answer

Mass number remains unchanged; atomic number decreases by one.

Question 10

In the nuclear reaction $^{223}_{87}Fr \rightarrow ^{219}_{85}At + ^{4}_{2}He$, what is the missing species if the reaction continues with a positron emission?

Accepted Answer

$^{219}_{84}Po$

Question 11

Which of the following nuclear reactions represents electron capture for $^{201}_{80}Hg$?

Accepted Answer

$^{201}_{80}Hg + ^{0}_{-1}e \rightarrow ^{201}_{79}Au$

Question 12

A patient is injected with $^{11}_{6}C$ for a PET scan. What nuclear process does this isotope undergo?

Accepted Answer

Positron emission

Question 13

Which of the following is the correct nuclear equation for the positron emission of $^{64}_{29}Cu$?

Accepted Answer

$^{64}_{29}Cu \rightarrow ^{64}_{28}Ni + ^{0}_{+1}e$

Question 14

Which of the following statements about positron emission is correct?

Accepted Answer

It decreases the atomic number of the nucleus by one.

Question 15

A nucleus of $^{137}_{55}Cs$ undergoes electron capture. What is the resulting daughter nucleus?

Accepted Answer

$^{137}_{54}Xe$

Question 16

Which of the following is a correct representation of a positron?

Accepted Answer

$^{0}_{+1}e$

Question 17

If $^{223}_{87}Fr$ undergoes alpha decay followed by positron emission, what is the final daughter nucleus?

Accepted Answer

$^{219}_{84}Po$

Question 18

Which of the following nuclear reactions is an example of electron capture?

Accepted Answer

$^{40}_{19}K + ^{0}_{-1}e \rightarrow ^{40}_{18}Ar$

Electron Capture and Positron Emission in Nuclear Chemistry

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