Using Table 1 from the previous question, which discovery was the most recent?
Tick (✔) one box.
Answer options:
A.
A
B.
B
C.
C
D.
D
How to approach this question
1. Recall the historical order of the models of the atom and the key discoveries.
- Rutherford (protons/nucleus) ~1911
- Bohr (electron shells) ~1913
- Chadwick (neutrons) ~1932
2. Identify which of the discoveries (A, B, C, D) happened last.
Full Answer
C.C✓ Correct
C: The nucleus contains neutrons.
As established in the previous question, the timeline is:
- ~1911: Rutherford discovers the positive nucleus containing protons (Discoveries A and D).
- 1913: Bohr proposes that electrons orbit in specific energy levels (Discovery B).
- 1932: Chadwick discovers the neutron in the nucleus (Discovery C).
Therefore, the discovery of the neutron was the most recent of the four options.
Common mistakes
✗ Confusing the order of the discoveries.
✗ Thinking that the electron shell model (Bohr) is more modern than the discovery of the neutron.
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