Worksheet: Electron Capture

In this worksheet, we will practice solving nuclear equations involving electron capture.

Q1:

Which of the following statements correctly describes electron capture?

  • AElectron capture is a process where, in a neutron-rich nucleus, a neutron decays into a proton, releasing a high-energy electron from the nucleus.
  • BElectron capture is a process where, in a proton-rich nucleus, a proton decays into a neutron, releasing a high-energy positron from the nucleus.
  • CElectron capture is a process where a proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, emitting an electron antineutrino.
  • DElectron capture is a process where a proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, emitting an electron neutrino.

Q2:

The graph shows an isotope of chromium becoming vanadium via electron capture.

What isotope of chromium does the graph show?

  • AChromium-53
  • BChromium-50
  • CChromium-52
  • DChromium-49
  • EChromium-51

What isotope of vanadium does the graph show?

  • AVanadium-51
  • BVanadium-52
  • CVanadium-49
  • DVanadium-50
  • EVanadium-53

Q3:

Which of the following types of particles are emitted when an atomic nucleus captures an electron?

  • AA positron
  • BA proton
  • CAn electron
  • DAn electron neutrino
  • EA neutron

Q4:

When an electron is captured by an atomic nucleus, by how much does the atomic number of the nucleus change?

Q5:

The graph shows an isotope of cobalt becoming a different element via electron capture. What element does this isotope of cobalt become?

  • ACopper
  • BIron
  • CNickel
  • DCobalt
  • EManganese

Q6:

When an electron is captured by an atomic nucleus, by how much does the mass number of the nucleus change?

Q7:

The following nuclear equation shows how an isotope of argon becomes an isotope of chlorine via electron capture.

371817eAr+eCl+𝜈

What is the value of 𝑟 in the equation?

Q8:

The following nuclear equation shows how an isotope of beryllium becomes an isotope of lithium via electron capture.

747eBe+eLi+𝜈

What is the value of 𝑟 in the equation?

Q9:

Gallium-67 can become zinc-67 via electron capture. Which of the lines on the graph shows this process?

  • Aiv
  • Bi
  • Cv
  • Dii
  • Eiii

Q10:

The following nuclear equation shows how an isotope of vanadium becomes an isotope of titanium via electron capture.

V+eTi+4922e𝜈

What are the values of 𝑟 and 𝑡 in this equation?

  • A𝑟=23, 𝑡=50
  • B𝑟=22, 𝑡=48
  • C𝑟=23, 𝑡=49
  • D𝑟=22, 𝑡=49
  • E𝑟=23, 𝑡=48

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