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NCERT Exemplar Solutions Class 9 Science Solutions for Structure of the Atom - Exercise in Chapter 4 - Structure of the Atom

Question 22 Structure of the Atom - Exercise

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order

(i) Rutherford’s atomic model

(ii) Thomson’s atomic model

(iii) 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:

Answer is (c) (ii), (i) and (iii)

Explanation:

Thomson’s atomic model was proposed in the year 1904

Rutherford’s atomic model was proposed in the year 1911

Bohr’s atomic model was proposed in the year 1913

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