Atomic Structure (Edexcel International A Level Chemistry)

Exam Questions

19 mins5 questions
11 mark

The numbers of subatomic particles present in four species W, X, Y and Z are given in the table.

Species Number of protons Number of neutrons Number of electrons
W 19 20 18
X 19 20 19
Y 20 20 18
Z 20 22 20

Which of these species are isotopic?

  • W and X

  • W and Y

  • X and Z

  • Y and Z

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21 mark

Iodine exists as one isotope with mass number 127.

Chlorine exists as two isotopes with mass numbers 35 and 37.

How many molecular ion (ICl3+) peaks are there in the mass spectrum of ICl3?

  • 2

  • 3

  • 4

  • 5

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3a1 mark

The diagram shows a mass spectrometer.

q3-paper-1-oct-2021-edexcel-ial-chemistry

a)
Which process occurs in region R?
  • the sample is vaporised using a heater

  • electrons are removed from molecules or atoms and positive ions are formed

  •  electrons are added to the molecules or atoms and negative ions are formed

  • ions are accelerated by an electric field

3b1 mark
b)
Which statement is correct for region T?
  • ions with a greater mass have a smaller deflection

  • ions with a greater mass have a greater deflection

  • ions with a greater charge have a smaller deflection

  •  ions are speeded up by a magnetic field

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4
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1 mark

The mass spectrum of a sample of an element has only two peaks.

q3-paper-1-june-2021-edexcel-ial-chemistry

What is the approximate relative atomic mass of the element in this sample?

  • 191.5

  • 192.0

  • 192.5

  • 193.0

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