Question 1

Which of the following best describes electron capture?

Accepted Answer

The absorption of an electron by an unstable nucleus, resulting in a decrease in atomic number.

Question 2

What is the balanced nuclear equation for the electron capture of nobelium-260 ($$^{260}_{102}No$$)?

Accepted Answer

$$^{260}_{102}No + e^- \$$rightarrow ^{260}$$_{101}Md$$

Question 3

During electron capture, what happens to the atomic number and mass number of the original atom?

Accepted Answer

Atomic number decreases by 1; mass number remains unchanged.

Question 4

Which of the following is the correct nuclear equation for the electron capture of lead-207 ($$^{207}_{82}Pb$$)?

Accepted Answer

$$^{207}_{82}Pb + e^- \$$rightarrow ^{207}$$_{81}Tl$$

Question 5

A sample of francium-233 undergoes electron capture. What is the resulting daughter nuclide?

Accepted Answer

$$^{233}_{86}Rn$$

Question 6

Which of the following statements about electron capture is correct?

Accepted Answer

Electron capture does not change the mass number of the atom.

Question 7

Given the following reaction: $$^{263}_{104}Rf + e^- \$$rightarrow ^{263}$$_{103}Lr$$, what type of nuclear process is occurring?

Accepted Answer

Electron capture

Question 8

If an atom of $$^{207}_{82}Pb$$ undergoes electron capture, what is the atomic number and mass number of the resulting atom?

Accepted Answer

Atomic number: 81, Mass number: 207

Question 9

Which of the following is a real-world application of electron capture?

Accepted Answer

Medical imaging using isotopes that decay by electron capture.

Question 10

A radioactive isotope undergoes electron capture and transforms into a new element. Which of the following best explains why the mass number does not change?

Accepted Answer

An electron is absorbed, converting a proton into a neutron, so the total number of nucleons remains the same.

Question 11

Which of the following nuclear equations represents the electron capture of $$^{233}_{87}Fr$$?

Accepted Answer

$$^{233}_{87}Fr + e^- \$$rightarrow ^{233}$$_{86}Rn$$

Question 12

Which of the following changes occurs in the nucleus during electron capture?

Accepted Answer

A proton is converted into a neutron.

Question 13

If $$^{260}_{102}No$$ undergoes electron capture, what is the symbol and atomic number of the daughter element?

Accepted Answer

Md, 101

Question 14

Which of the following is a balanced nuclear equation for the electron capture of $$^{263}_{104}Rf$$?

Accepted Answer

$$^{263}_{104}Rf + e^- \$$rightarrow ^{263}$$_{103}Lr$$

Question 15

A scientist observes that after electron capture, the atomic number of a sample decreases but the mass number remains the same. Which process is most likely responsible?

Accepted Answer

Electron capture

Question 16

Which of the following best explains why electron capture is classified as a type of beta decay?

Accepted Answer

It involves a change in the number of protons and neutrons in the nucleus, similar to other beta decay processes.

Electron Capture and Nuclear Equations in GOB Chemistry

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