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Physics Question 44 – JEE-MAIN 2025

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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R \ Assertion A : The Bohr model is applicable to hydrogen and hydrogen-like atoms only. \ Reason R : The formulation of Bohr model does not include repulsive force between electrons. \ In the light of the above statements, choose the correct answer from the options given below

Recall the fundamental assumptions and successes of the Bohr model, particularly regarding the types of atomic systems it can accurately describe.

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Ninja Strategy•Fundamental Principles Check

Quickly recall the core assumptions and known limitations of the Bohr model to verify the truthfulness of both statements and their causal link.

Step 1: Analyze Assertion A✦ Active

Assertion A states that the Bohr model is applicable to hydrogen and hydrogen-like atoms only. The Bohr model is based on a single electron orbiting a nucleus and successfully explains the energy levels and spectra of hydrogen and single-electron ions (hydrogen-like atoms like He+ and Li2+). It fails for multi-electron atoms. Thus, Assertion A is true.

Step 2: Analyze Reason R○ Expand

Reason R states that the formulation of the Bohr model does not include repulsive force between electrons. The Bohr model considers only the electrostatic attraction between the nucleus and a single electron. It does not account for the repulsive forces between multiple electrons in multi-electron atoms. Thus, Reason R is true.

Step 3: Evaluate the Relationship○ Expand

The failure of the Bohr model for multi-electron atoms (as stated in Assertion A) is directly attributed to its inability to account for electron-electron repulsion (as stated in Reason R). Therefore, Reason R is the correct explanation for Assertion A.

💡 Teacher's Secret Hint

The limitations of a model are often directly linked to the approximations or neglected forces in its formulation.

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