Q5. Why was a change in the Bohr Model of atom required? Due to which important development (s), the concept of movement of an electron in an orbit was replaced by, the concept of probability of finding an electron in an orbital? What is the name given to the changed model of the atom?
Answer. A modification to the Bohr model was required due to certain defects. The Bohr model applied to atoms with a single electron. It cannot account for multi-electron atoms. It also claims that electrons move in circular orbits around the nucleus, which is incorrect. The dual behaviour of matter and the Heisenberg uncertainty principle were two significant developments that contributed significantly to the formulation of such a model. In 1972, Werner Heisenberg, a German physicist, stated the uncertainty principle, which is the result of the dual behaviour of matter and radiation. The existence of definite paths or trajectories of electrons and other similar particles is governed by the Heisenberg Uncertainty Principle, which is one of its most important implications. Quantum mechanics is a theoretical science that studies the motions of microscopic objects that have both observable wave and particle properties. The new atom model is known as the Quantum Mechanical Model of Atom.
