DP Chemistry (last assessment 2024)

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Question 21N.2.sl.TZ0.b(i)

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Date November 2021 Marks available [Maximum mark: 2] Reference code 21N.2.sl.TZ0.b(i)
Level sl Paper 2 Time zone TZ0
Command term Sketch Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 2]
21N.2.sl.TZ0.b(i)

Fast moving helium nuclei (4He2+) were fired at a thin piece of gold foil with most passing undeflected but a few deviating largely from their path. The diagram illustrates this historic experiment.

Figure from PPLATO / FLAP (Flexible Learning Approach To Physics), http://www.met.reading.ac.uk/pplato2/h-flap/
phys8_1.html#top 1996 The Open University and The University of Reading.

Subsequent experiments showed electrons existing in energy levels occupying various orbital shapes.

Sketch diagrams of 1s, 2s and 2p.

[2]

Markscheme

1s AND 2s as spheres ✔

one or more 2p orbital(s) as figure(s) of 8 shape(s) of any orientation (px, py pz) ✔

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