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A LevelChemistryCambridge (CIE)Exam Questions1. Atomic StructureIsotopes

Isotopes (Cambridge (CIE) A Level Chemistry): Exam Questions

Exam code: 9701

27 mins12 questions

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Isotopes

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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

Choose your answer

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

Choose your answer

31 mark

Which of the following is not the same between isotopes?

  • Atomic number

  • Chemical formula

  • Chemical properties

  • Mass number

Choose your answer

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

Choose your answer

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

Choose your answer

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

    Choose your answer

    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.

    Choose your answer

    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

    Choose your answer

    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

    Choose your answer