Question

Arrange the following statements given by various scientists in chronological order:
1) Calculation of energy and radius of the orbit
2) Atoms of the same elements are identical in all respects
3) Calculation of the diameter of the nucleus and the atom
4) Assumption of thinly spread positively charged mass

• A. $4312$
• B. $4231$
• C. $2431$
• D. $3421$

Answer 1

The correct option is C

$2431$

The explanation for the correct option: (C)

(i) Atoms of the same elements are identical in all respects is the important postulate of Dalton's theory $\left(1808\right)$.
(ii) Assumption of thinly spread positively charged mass. This is an important postulate of Thomson's model $\left(1897\right)$.
(iii) Calculation of the diameters of the nucleus and the atom $\left(1911\right)$.
(iv) Calculation of energy and radius of the orbit is developed by Bohr $\left(1913\right)$.

The explanation for the incorrect options:

(A) The given option $4312$ is not the chronological order.

(B) The correct chronological order is $2431$. It is not $4231$.

(D) The given option $3421$ is not the chronological order.

Hence, option (C) is correct - The correct chronological order is $2431$.