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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