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Question 21M.2.HL.TZ2.c

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Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.HL.TZ2.c
Level HL Paper 2 Time zone TZ2
Command term Draw Question number c Adapted from N/A
c.
[Maximum mark: 3]
21M.2.HL.TZ2.c

Thallium-205 (Tl81205) can also form from successive alpha (α) and beta-minus (β−) decays of an unstable nuclide. The decays follow the sequence α β− β− α. The diagram shows the position of Tl81205 on a chart of neutron number against proton number.

Draw four arrows to show the sequence of changes to N and Z that occur as the Tl81205 forms from the unstable nuclide.

[3]

Markscheme

any α change correct ✓

any β change correct ✓

diagram fully correct ✓


Award [2] max for a correct diagram without arrows drawn.

For MP1 accept a (−2, −2 ) line with direction indicated, drawn at any position in the graph.

For MP2 accept a (1, −1) line with direction indicated, drawn at any position in the graph.

Award [1] max for a correct diagram with all arrows in the opposite direction.

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