5.2.3a Radioactive decay

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Question 42

The table below gives details about some radioactive substances.

Substance	Symbol	Type of radiation emitted	Half-life
sodium-24	$1124Na^{24}_{11}\text{Na}$	beta ( $β\beta$ )	15 hours
radon-222	$86222Rn^{222}_{86}\text{Rn}$	alpha ( $α\alpha$ )	3.8 days
xenon-133	$54133Xe^{133}_{54}\text{Xe}$	beta ( $β\beta$ )	5.2 days
krypton-81	$3681Kr^{81}_{36}\text{Kr}$	gamma ( $γ\gamma$ )	13 seconds

Which of these substances has the greatest number of nucleons (protons and neutrons) in the nucleus of its atoms?

[1]

Which of these substances has the least number of electrons in the orbits of a neutral atom?

[1]

Which of these substances emit particles during radioactive decay?

[1]

Samples of each of these substances are decaying. Each sample starts with the same number of atoms. Which sample decays the most in one minute?

[1]

In a medical lung-ventilation test, a patient inhales a radioactive gas. The radiation needs to be highly penetrating to be detected outside the body, and the substance must decay very quickly to minimize the radiation dose to the patient. Which of these substances is most suitable?

[1]

5.2.3a Radioactive decay

Question 42

The table below gives details about some radioactive substances.

Substance	Symbol	Type of radiation emitted	Half-life
sodium-24	$1124Na^{24}_{11}\text{Na}$	beta ( $β\beta$ )	15 hours
radon-222	$86222Rn^{222}_{86}\text{Rn}$	alpha ( $α\alpha$ )	3.8 days
xenon-133	$54133Xe^{133}_{54}\text{Xe}$	beta ( $β\beta$ )	5.2 days
krypton-81	$3681Kr^{81}_{36}\text{Kr}$	gamma ( $γ\gamma$ )	13 seconds

Which of these substances has the greatest number of nucleons (protons and neutrons) in the nucleus of its atoms?

[1]

Which of these substances has the least number of electrons in the orbits of a neutral atom?

[1]

Which of these substances emit particles during radioactive decay?

[1]

Samples of each of these substances are decaying. Each sample starts with the same number of atoms. Which sample decays the most in one minute?

[1]

5.2.3a Radioactive decay

Question 42

Markscheme

5.2.3a Radioactive decay

Question 42

Markscheme

5.2.3a Radioactive decay

Question 42

5.2.3a Radioactive decay Questions

5.2.3a Radioactive decay

Question 42

5.2.3a Radioactive decay Questions