Question

Of the following, Bohr's atomic model is applicable to:

• A. Explain relative intensities of spectral lines emitted by hydrogen atoms
• B. Helium atom
• C. Lithium atom
• D. Hydrogenic atoms

Hint:

Bohr’s model only applies to single-electron systems. Multi-electron atoms require quantum mechanical models for accurate descriptions.

Answer 1

The Correct Option is D

Step 1: Understanding Bohr's Atomic Model Bohr's atomic model was developed to explain the structure of atoms and their energy levels. It successfully describes: - Quantized energy levels for electrons. - Emission spectra of hydrogen-like atoms (single-electron systems). Step 2: Applicability of Bohr’s Model Bohr’s model is valid only for hydrogenic atoms—atoms with a single electron, such as: - Hydrogen (\( H \)), - Helium ion (\( He^+ \)), - Lithium ion (\( Li^{2+} \)). For multi-electron atoms, electron-electron interactions make Bohr’s model inaccurate. Conclusion Thus, the correct answer is: \[ \text{Hydrogenic atoms} \]