A LevelChemistryCIETopic Questions1. Atomic Structure1.2 Isotopes

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First teaching 2023

First exams 2025

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Isotopes (CIE A Level Chemistry)

Topic Questions

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11 mark

Elements can be found to have different isotopes.

What is different about the nuclei of isotopes?

  • The same number of protons, but different number of neutrons

  • The same number of protons, and the same number of neutrons

  • A different number of protons, and a different number of neutrons

  • A different number of protons, and the same number of neutrons

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21 mark

Which of the following statements about isotopes is not correct?

  • The carbon-14 isotope contains 2 more neutrons than the carbon-12 isotope

  • In a silicon-30 isotope, there are 14 protons

  • Isotopes contain different numbers of protons

  • In a magnesium-26 isotope there are 14 neutrons

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31 mark

Which of the following is not the same between isotopes?

  • Atomic number

  • Chemical formula

  • Chemical properties

  • Mass number

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11 mark

Which statement explains the similarity in chemical behaviour for isotopes of the same element?

  • They may have the same electronic configuration, depending on the reaction.

  • They have the same electronic configuration.

  • Their mass numbers are different.

  • They have different numbers of neutrons.

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21 mark

Which of the following represents a pair of isotopes?

  • I2 and I3–

  • Ba presubscript 56 presuperscript 130 space and space Cs presubscript 55 presuperscript 130

  • Pb presubscript 82 presuperscript 206 space and space Pb presubscript 82 presuperscript 208

  • straight C presubscript 6 presuperscript 14 space and space straight N presubscript 7 presuperscript 14

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31 mark

The mass spectrum of element X is shown below.

2-1-m-q9-mcqs-ib-chemistry
Which of the following statements is correct?

  • X has a relative atomic mass between 70 and 71

  • The three isotopes of X are separated after being converted to anions

  • The most abundant isotope of X contains 71 neutrons

  • The isotope of X with mass 72 will be deflected the most

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11 mark

The isotope Co presubscript 27 presuperscript 60 is used in the treatment of cancer cells in the body. 

Which statement about this isotope is not correct?

  • The charge on the nucleus is +27

  • There are 33 neutrons in the nucleus

  • It has the same number of neutrons as other isotopes of cobalt

  • It has the same chemical properties as other cobalt isotopes

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2
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An isotope of element X contains the same number of neutrons as are found in an atom of 53Mn. The isotope of X also contains 23 protons.

Which is the correct symbol for isotope X?

  • X presubscript 28 presuperscript 51

  • straight V presubscript 23 presuperscript 51

  • straight X presubscript 23 presuperscript 28

  • straight X presubscript 23 presuperscript 51

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3
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Which atom is not an isotope of bromine?

  Number of neutrons Mass number
A 37 72
B 39 73
C 41 76
D 43 78

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