Question
Write the limitations of Bohr model.
✓
Answer
→The limitations of the Bohr model are as follows.
(i) The Bohr model is applicable to hydrogenic atoms. It cannot be extended even to more two electron atoms such as helium.
→The analysis of atoms with more than one electron was attempted on the lines of Bohr's model for hydrogenic atoms but did not meet with any success. Because the electron interacts not only with the positively charged nucleus but also with all other electrons.
(ii) The Bohr's model correctly predicts the frequencies of the light emitted by hydrogenic atoms. However, the model cannot explain the relative intensities of the frequencies in the spectrum.
→In emission spectrum of hydrogen, some of the visible frequencies have weak intensity, others strong which cannot be explained by Bohr's model.
→Experimental observation show that some transitions are more favoured than others. Bohr's model is unable to account for the intensity variation.
(i) The Bohr model is applicable to hydrogenic atoms. It cannot be extended even to more two electron atoms such as helium.
→The analysis of atoms with more than one electron was attempted on the lines of Bohr's model for hydrogenic atoms but did not meet with any success. Because the electron interacts not only with the positively charged nucleus but also with all other electrons.
(ii) The Bohr's model correctly predicts the frequencies of the light emitted by hydrogenic atoms. However, the model cannot explain the relative intensities of the frequencies in the spectrum.
→In emission spectrum of hydrogen, some of the visible frequencies have weak intensity, others strong which cannot be explained by Bohr's model.
→Experimental observation show that some transitions are more favoured than others. Bohr's model is unable to account for the intensity variation.
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