explain briefly the postulates of the bohrs atomic theory of 5 points
Answers
Explanation:
Thomson’s Atomic Model- Postulates
According to the postulates of Thomson’s atomic model, an atom resembles a sphere of positive charge with electrons (negatively charged particles) present inside the sphere.
The positive and negative charge is equal in magnitude and therefore an atom has no charge as a whole and is electrically neutral.
Thomson’s atomic model resembles a spherical plum pudding as well as a watermelon. It resembles a plum pudding because the electrons in the model look like the dry fruits embedded in a sphere of positive charge just like a spherical plum pudding. The model has also been compared to a watermelon because the red edible part of a watermelon was compared to the sphere having a positive charge and the black seeds filling the watermelon looked similar to the electrons inside the sphere.
Thomson's atomic model
Thomson’s Atomic Model
(Source Credit: Wikipedia)
Limitations of Thomson’s Atomic Model
Thomson’s atomic model failed to explain how the positive charge holds on the electrons inside the atom. It also failed to explain an atom’s stability.
The theory did not mention anything about the nucleus of an atom.
It was unable to explain the scattering experiment of Rutherford
Bohr modified this atomic structure model by explaining that electrons move in fixed orbitals (shells) and not anywhere in between and he also explained that each orbit (shell) has a fixed energy level. Rutherford basically explained the nucleus of an atom and Bohr modified that model into electrons and their energy levels.