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Atomic Structure · CSEC Chemistry

55 past-paper questions on Atomic Structure, part of Principles of Chemistry, from every CSEC Chemistry paper on Quelpr.

Practise Atomic Structure
  1. 2(a)3 marks· Chemistry Q2 2(a)Draw a labelled diagram to illustrate the number of protons, neutrons and electrons present in an atom of B.
  2. 2(a)(i)1 mark· Chemistry Q2 2(a)(i)What is the atomic number of Element Y?
  3. 2(a)(i)2 marks· Chemistry Q2 2(a)(i)Define 'isotopes'.
  4. 2(a)(i)1 mark· Chemistry Q2 2(a)(i)Define the term 'isotopes'.
  5. 2(a)(i)2 marks· Chemistry Q2 2(a)(i)In the space below draw a diagram to show the arrangement of electrons in the chlorine atom. [Atomic number = 17]
  6. 2(a)(i)2 marks· Chemistry Q2 2(a)(i)What differences, if any, are expected between the chemical reactions of chlorine 35 and chlorine 37? Explain your answer.
  7. 2(a)(ii)2 marks· Chemistry Q2 2(a)(ii)Hence, show by calculation that chlorine-35 and chlorine-37 are isotopes.
  8. 2(a)(ii)1 mark· Chemistry Q2 2(a)(ii)State ONE use of carbon - 14.
  9. 2(a)(ii)3 marks· Chemistry Q2 2(a)(ii)Determine the number of electrons, protons and neutrons in the anion formed from the chlorine 37 atom.
  10. 2(b)2 marks· Chemistry Q2 2(b)State TWO uses of radioisotopes.
  11. 2(b)2 marks· Chemistry Q2 2(b)Write the electron configurations of ³⁷₁₇Cl and ¹⁴₆C.
  12. 2(b)(i)1 mark· Chemistry Q2 2(b)(i)Write the electronic configuration for magnesium.
  13. 2(b)(ii)2 marks· Chemistry Q2 2(b)(ii)Both P and Q give similar products when reacted with water. Account for this observation.
  14. 2(b)(iii)1 mark· Chemistry Q2 2(b)(iii)Q is radioactive. Radioactive substances are widely used in medicine, agriculture and industry. What is meant by the term 'radioactive'?
  15. 2(b)(iv)2 marks· Chemistry Q2 2(b)(iv)Give TWO uses of radioactive elements in medicine, agriculture or industry.
  16. 2(c)3 marks· Chemistry Q2 2(c)Analysis of a sample of ICl shows that it consists of molecules of the same molecular formula, but with different molar masses. What is a possible explanation for this?
  17. 2(d)2 marks· Chemistry Q2 2(d)Draw a diagram to show the arrangement of electrons in sulfur.
  18. 3(a)4 marks· Chemistry Q3 3(a)Complete Table 4 by writing the required information in the relevant spaces.
  19. 4(a)3 marks· Chemistry Q4 4(a)Define the term 'isotope' and hence show by calculation that ¹²C and ¹³C are isotopes.
  20. 4(a)4 marks· Chemistry Q4 4(a)State TWO other uses of radioisotopes and explain the importance of EACH.
  21. 4(a)(i)2 marks· Chemistry Q4 4(a)(i)Define EACH of the following terms: Atomic number
  22. 4(a)(ii)2 marks· Chemistry Q4 4(a)(ii)Define EACH of the following terms: Mass number
  23. 4(b)3 marks· Chemistry Q4 4(b)State THREE other uses of radioisotopes.
  24. 4(b)(i)2 marks· Chemistry Q4 4(b)(i)Draw a diagram to show the arrangement of electrons in a sodium atom.
  25. 2(a) [P2]12 marks· CSEC Chemistry · January 2002 · Paper 2Complete Table 1 by filling in the missing values for Species, Atomic Number, Mass Number, Arrangement of Electrons, Number of Neutrons, Formula of Chloride, and Type of Bonding.
  26. 2(b) [P2]3 marks· CSEC Chemistry · January 2002 · Paper 2Illustrate, using an example, what you understand by the term 'isotope'.
  27. Q21 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1Which of the properties above refer to a neutron?
  28. Q61 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1Which of the following statements BEST describes the difference between an atom and an ion?
  29. Q51 mark · multiple choice· CSEC Chemistry · January 2018 · Paper 1Two particles have the following compositions: (i) 10 protons, 12 neutrons, 10 electrons (ii) 10 protons, 11 neutrons, 10 electrons Therefore, BOTH particles are
  30. Q61 mark · multiple choice· CSEC Chemistry · January 2018 · Paper 1In the notation ^{35}_{17}\text{Cl} the number 17 represents the
  31. Q21 mark · multiple choice· CSEC Chemistry · January 2019 · Paper 1In the notation ^{35}_{17}\text{Cl}, the subscript 17 represents the
  32. Q101 mark · multiple choice· CSEC Chemistry · January 2019 · Paper 1Which of the properties above refer to a neutron?
  33. Q111 mark · multiple choice· CSEC Chemistry · January 2019 · Paper 1Which of the properties above refer to a proton?
  34. 4(a)(i)4 marks· CSEC Chemistry · January 2021 · Paper 2Complete Table 3 showing the three subatomic particles and their relative masses and charges.
  35. 4(a)(ii)5 marks· CSEC Chemistry · January 2021 · Paper 2Consider the notation of an atom of an unknown element, ²⁹₁₄A. Draw a labelled diagram to illustrate the location, arrangement and number of EACH type of subatomic particle in Element ²⁹₁₄A.
  36. Q31 mark · multiple choice· CSEC Chemistry · May/June 2010 · Paper 1X and Y are isotopes. Which of the following would be true for the atoms X and Y? I. They have the same number of electrons. II. They have the same number of protons. III. They have different numbers of neutrons.
  37. Q51 mark · multiple choice· CSEC Chemistry · May/June 2010 · Paper 1An isotope of lead can be represented by the following symbol ^{207}_{82}\text{Pb}. From this symbol, it can be deduced that one atom of the isotope has
  38. Q21 mark · multiple choice· CSEC Chemistry · May/June 2011 · Paper 1The particle X is an atom of
  39. Q31 mark · multiple choice· CSEC Chemistry · May/June 2011 · Paper 1Which of the following particles represents an anion?
  40. Q41 mark · multiple choice· CSEC Chemistry · May/June 2011 · Paper 1Which of the following pairs are isotopes?
  41. Q11 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1'Mass number' is the number of
  42. Q21 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1Which TWO of the following features are true about the arrangement of electrons, protons and neutrons in an atom? I. Protons and neutrons are found in the nucleus. II. Electrons can be found anywhere outside the…
  43. Q21 mark · multiple choice· CSEC Chemistry · May/June 2015 · Paper 1'Mass number' is the number of
  44. Q41 mark · multiple choice· CSEC Chemistry · May/June 2015 · Paper 1An atom that has 20 electrons when it ionizes has the same electronic configuration as
  45. Q51 mark · multiple choice· CSEC Chemistry · May/June 2015 · Paper 1^{24}_{11}\text{Na} and ^{23}_{11}\text{Na} are isotopes because they
  46. Q41 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following statements BEST describes the difference between an atom and an ion?
  47. Q51 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following features are true about the arrangement of electrons, protons and neutrons in an atom? I. Protons and neutrons are found in the nucleus. II. Electrons can be found anywhere outside the nucleus.…
  48. Q61 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1The mass number of an element is the number of
  49. Q71 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1^{24}_{11}\text{Na} and ^{23}_{11}\text{Na} are isotopes because they
  50. Q101 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following pairs of atoms has the same number of neutrons?
  51. Q291 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1In the following diagram, X represents the symbol of a positive ion: ^{40}_{20}\text{X}^{2+} Which of the following pairs represents the number of neutrons and electrons in X? | | Number of Neutrons | Number of…
  52. Q41 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1An atom has 20 electrons. When it ionizes, it has the same electronic configuration as
  53. Q231 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1The atomic number of an element is defined as the number of
  54. Q261 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1The element that is used to determine the relative atomic mass of other elements is
  55. Q311 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1An atom with atomic structure ^{27}_{13}\text{X} contains

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