ASChemistryCambridge (CIE)Exam Questions1. Atomic StructureIsotopes

Isotopes (Cambridge (CIE) AS Chemistry): Exam Questions

Exam code: 9701

28 mins13 questions

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Isotopes

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1
1 mark

Which statement describes the nuclei of different isotopes of the same element?

  • They contain the same number of protons but a different number of neutrons.

  • They contain the same number of protons and the same number of neutrons.

  • They contain a different number of protons and a different number of neutrons.

  • They contain a different number of protons but the same number of neutrons.

Choose your answer

2
1 mark

Which statement about isotopes is not correct?

  • An atom of 14C contains two more neutrons than an atom of 12C.

  • An atom of 30Si contains 14 protons.

  • An atom of 31P contains 16 protons.

  • An atom of 26Mg contains 14 neutrons.

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3
1 mark

Which property is different for isotopes of the same element?

  • chemical properties

  • electronic configuration

  • nucleon number

  • proton number

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1
1 mark

Which statement about the isotope 60Co 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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1 mark

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

What is the correct nuclide symbol for this isotope of X?

  • _{23}^{51}\text{V}

  • _{28}^{51}\text{Ni}

  • _{23}^{28}\text{V}

  • _{51}^{23}\text{Sb}

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3
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1 mark

Which row represents an atom that is not an isotope of bromine?

number of neutrons

nucleon number

A

37

72

B

39

73

C

41

76

D

43

78

    Choose your answer

    4
    1 mark

    Which statement defines the relative atomic mass, Ar, of an element?

    • The average mass of one atom of the element compared to the mass of an atom of hydrogen-1.

    • The weighted average mass of one atom of the element compared to one-twelfth of the mass of an atom of carbon-12.

    • The mass of one mole of the element relative to the mass of exactly 12.00 g of carbon-12.

    • The sum of the masses of all naturally occurring isotopes of the element divided by the total number of isotopes.

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    1
    1 mark

    Which statement explains why isotopes of the same element have identical chemical properties?

    • They contain the same number of protons.

    • They have the same electronic configuration.

    • They have different nucleon numbers.

    • They have different numbers of neutrons.

    Choose your answer

    2
    1 mark

    Which pair of species are isotopes of each other?

    • 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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    3
    1 mark

    The mass spectrum of element X is shown below.

    Mass spectrum of element X showing three peaks at m/e = 70, 71, and 72. The peak at m/e = 71 has the greatest abundance, the peak at m/e = 70 has the second greatest abundance, and the peak at m/e = 72 has the lowest abundance.

    Which statement is correct?

    • X has a relative atomic mass between 70.0 and 71.0

    • The relative atomic mass of X is exactly 71.0

    • The most abundant isotope of X contains 71 neutrons

    • The peak at m/e = 70 is caused by an isotope of X containing 70 protons

    Choose your answer