The statements given below are the postulates of various atomic models. Arrange them in chronological order.
(1) Fine structure is due to the presence of subshells in the main energy level
(2) The size of an atom is much larger than the size of its nucleus
(3) As long as the electron is present in a particular orbit, its energy remains constant
(4) Negatively charged particles are uniformly spread in the lump of positive charge

$4, 3, 2, 1$

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$2, 3, 4, 1$

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$4, 2, 3, 1$

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$3, 4, 2, 1$

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Solution

The correct option is C
$4, 2, 3, 1$

The explanation for the correct option: (C)
Negatively charged particles are uniformly spread in the lump of positive charge (Thomson's model) $(1900)$ .
The size of the atom is much larger than the size of its nucleus (Rutherford's model). $(1911)$
As long as the electron is present in a particular orbit, its energy remains constant (Bohr's model). $(1913)$
The fine structure is due to the presence of subshells in the main energy level (Sommerfeld's model). $(1915)$
The explanation for the incorrect options:
(A) The correct chronological order of the postulates of various atomic models is not $4, 3, 2, 1$ .
(B) It is not the given order $2, 3, 4, 1$ that represents the correct chronological order of the postulates of various atomic models.
(D) The correct chronological order of the postulates of various atomic models is not $3, 4, 2, 1$ .
Hence, option (C) is correct - The correct chronological order of the postulates of various atomic models is $4, 3, 2, 1$ .

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