Write bohr atomic model and mention its two main demerits
Answers
The electrons move around in a predictable path called orbits. Bohr modified Rutherford’s model where he explained that electrons move around in fixed orbital shells. Furthermore, he explained that each orbital shell has fixed energy levels. Therefore, Rutherford basically explained a nucleus of an atom whereas Bohr took the model one step ahead. He explained about electrons and the different energy levels associated with it.
According to Bohr Atomic model, a small positively charged nucleus is surrounded by revolving negatively charged electrons in fixed orbits. He concluded that electron will have more energy if it is located away from the nucleus whereas the electrons will have less energy if it located near the nucleus.
Limitations of Bohr’s Model of an Atom:
• Failure to explain Zeeman Effect (how atomic spectra are affected by magnetic fields).
• It contradicts Heisenberg Uncertainty Principle.
• Unable to explain how to determine the spectra of larger atoms.