2. Discuss the drawback of Rutherford's atomic model. State Bohr's postulates of
atomic model to eliminate the defects of Rutherford's atomic model.
Answers
Rutherford's atomic model was applicable only for H atom.According to Jhor electrons revolve in definite path called orbitals
No 2 electrons can have equal spin
Each orbital can have only a pair of electron.
Ans:
According to Rutherford the electrons revolve around the positive charged nucleus. But if it so happened the electrons slowly came close to nucleus due to their mutual attraction and suddenly atom collapse. Which do not occur at all.
To overcome the above defects of Rutherford’s model, Niels Bohr in 1913 gave a its atomic model based on Quantum theory of radiation which is popularly known as Bohr’s Atomic Model. The important postulates are:
1. In an atom, the electrons revolve around the nucleus in certain definite circular paths called orbits, or shells named as K, L , M…….
of Bohr’s Atomic model
According to Rutherford the electrons revolve around the positive charged nucleus. But if it so happened the electrons slowly came close to nucleus due to their mutual attraction and suddenly atom collapse. Which do not occur at all.
To overcome the above defects of Rutherford’s model, Niels Bohr in 1913 gave a its atomic model based on Quantum theory of radiation which is popularly known as Bohr’s Atomic Model. The important postulates are:
1. In an atom, the electrons revolve around the nucleus in certain definite circular paths called orbits, or shells named as K, L , M…….
2. Each shell or orbit corresponds to a definite energy. Therefore, these circular orbits are also known as energy levels or energy shells.
3. The energy of an orbit is quantized.
Since, electrons can be present only in these orbits, hence, these electrons can only have energies corresponding to these energy levels, i.e., electrons in an atom can have only certain permissible energies .
4. The electrons present in an atom can move from a lower energy level to a level of higher energy by absorbing the appropriate energy. Similarly, an electron can jump from a higher energy level to a lower energy level by losing the appropriate energy.