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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order:
  1. Rutherford’s atomic model.
  2. Thomson’s atomic model.
  3. Bohr’s atomic model.
  • A
    (i), (ii) and (iii)
  • B
    (ii), (iii) and (i)
  • C
    (ii), (i) and (iii)
  • D
    (iii), (ii) and (i)
✓

Answer

  1. (ii), (i) and (iii)

Explanation:

The first model of the atom was developed by JJ Thomson in 1904, who thought that atoms were composed purely of negatively charged electrons. This model was known as the 'plum pudding' model.

This theory was then disproved by Ernest Rutherford and the gold foil experiment in 1911, where Rutherford shot alpha particles at gold foil, and noticed that some went through and some bounced back, implying the existence of a positive nucleus.

In 1913, Niels Bohr proposed a model of the atom where the electrons were contained within quantized shells that orbited the nucleus.

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