| Date | May 2019 | Marks available | 1 | Reference code | 19M.1.hl.TZ2.5 |
| Level | HL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 5 | Adapted from | N/A |
Question
Which of the following transitions in the hydrogen atom emits the least energy?
A. n = 2 to n = 1
B. n = 3 to n = 1
C. n = 4 to n = 2
D. n = 4 to n = 3
Markscheme
D
Examiners report
81 % of the candidates identified the transition the emits the least energy in the given four transitions in the hydrogen atom (which was n=4 to n=3). The most commonly chosen distractor was A (n=2 to n=1) which means these candidates did not realize that the energy levels in the hydrogen atom converge at higher energy.
Syllabus sections
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17M.1.hl.TZ1.5:
Which statement explains one of the decreases in first ionization energy (I.E.) across period 3?
A. The nuclear charge of element Al is greater than element Mg.
B. The electron-electron repulsion is greater, for the electron with the opposite spin, in element S than in element P.
C. A new sub-level is being filled at element S.
D. The p orbital being filled in element Al is at a lower energy than the s orbital in element Mg.
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22M.1.hl.TZ1.5:
The graph shows the first six ionization energies of an element.
[Ionization energies of the elements (data page) Available at: https://en.wikipedia.org/wiki/Ionization_energies_of_the_
elements_(data_page) Text is available under the Creative Commons Attribution-ShareAlike License 3.0 (CC BY-SA
3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en.]
In which group is the element?A. 13
B. 14
C. 15
D. 16
- 18M.1.hl.TZ2.5: The graph shows the first ionization energies of some consecutive elements. Which...
- 18M.1.hl.TZ1.5: Which transition on the diagram corresponds to the ionization of hydrogen in the ground state?
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18M.2.hl.TZ1.2e:
Sketch a graph of the first six ionization energies of calcium.
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17M.2.hl.TZ1.2d.iv:
Explain why an aluminium-titanium alloy is harder than pure aluminium.
- 16N.1.hl.TZ0.6: A period 3 element, M, forms an oxide of the type M2O. Which represents the first four...
- 18N.1.hl.TZ0.5: The values for the first three successive ionization energies for two elements X and Z are...
- 18N.2.hl.TZ0.4c: Sketch a graph to show the relative values of the successive ionization energies of boron.
- 19M.1.hl.TZ1.5: Which element is represented by the first eight successive ionization energies on the...
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17N.1.hl.TZ0.6:
The graph represents the first ten ionisation energies (IE) of an element.
What is the element?
A. O
B. S
C. Ne
D. Cl
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18M.2.hl.TZ2.3a.iii:
Hydrogen spectral data give the frequency of 3.28 × 1015 s−1 for its convergence limit.
Calculate the ionization energy, in J, for a single atom of hydrogen using sections 1 and 2 of the data booklet.
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16N.2.hl.TZ0.4d:
(i) Explain the convergence of lines in a hydrogen emission spectrum.
(ii) State what can be determined from the frequency of the convergence limit.
-
17M.2.hl.TZ2.4c:
The first six ionization energies, in kJ mol–1, of an element are given below.
Explain the large increase in ionization energy from IE3 to IE4.
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19M.2.hl.TZ1.3a:
Plot the relative values of the first four ionization energies of sodium.
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17M.2.hl.TZ1.2d.iii:
Sketch a graph of the first six successive ionization energies of vanadium on the axes provided.
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19N.2.hl.TZ0.1e(ii):
Determine, showing your working, the wavelength, in m, of ultraviolet light absorbed by a single molecule in one of these steps. Use sections 1, 2 and 11 of the data booklet.
- 19N.1.hl.TZ0.5: Which shows the first ionization energies of successive elements across period 2, from left...
- 21M.1.hl.TZ1.6: The diagram shows the first ionisation energies of consecutive elements in the same period of...
- 21M.2.hl.TZ1.1c: Sketch the first eight successive ionisation energies of sulfur.
- 21M.1.hl.TZ2.5: The first eight successive ionization energies for an element are shown. In which group is...
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19M.2.hl.TZ2.3c:
Explain why the first ionization energy of nitrogen is greater than both carbon and oxygen.
Nitrogen and carbon:
Nitrogen and oxygen:
- 22M.2.hl.TZ2.5a(ii): Explain why there is a large increase from the 8th to the 9th ionization energy of iron.
- 20N.1.hl.TZ0.5: Which element is in group 13?
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20N.2.hl.TZ0.6a:
The electron configuration of copper makes it a useful metal.
Determine the frequency of a photon that will cause the first ionization of copper. Use sections 1, 2 and 8 of the data booklet.
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21M.2.hl.TZ2.2a(ii):
Explain why the first ionization energy of sulfur is lower than that of phosphorus.
- 22M.2.hl.TZ1.1e(iv): Suggest, giving a reason, whether magnesium or nitrogen would have the greater sixth...
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21N.2.hl.TZ0.2b:
Sodium emits yellow light with a frequency of 5.09 × 1014 Hz when electrons transition from 3p to 3s orbitals.
Calculate the energy difference, in J, between these two orbitals using sections 1 and 2 of the data booklet.
Darling, D, n.d. D lines (of sodium). [online] Available at <https://www.daviddarling.info/encyclopedia/D/D_lines.html> [Accessed 6 May 2020].
- 21N.1.hl.TZ0.5: Which statement explains why the second ionization energy of aluminium is higher than the...
