Notes On Gaseous State This page provides you all details about the gaseous state of BSc standard. Concerned problems will be solved at the end of each concept. Continue till the end to find the easiest explanation of every concept you need in this regard . Postulates of Kinetic Theory of Gases: 1. All gas consist of a very large number of minute particles, called molecules. 2. The gas molecules are extremely small in size and are separated by large distance. The actual volume of the gas molecules is thus negligible as compared to the total volume occupied by the gas. 3. The pressure exerted by the gas is due to the bombardment of the molecules on the walls of the vessel. 4. The gas molecules collide with one another and also with the walls of the vessels. These collisions are perfectly elastic and there is no loss of energy during these collisions. 5. The distance between the gas molecules are very large. Thus, there is no effective force of attraction or r
Notes on Atomic Structure Bohr's Atomic Model In 1913, Niels Bohr brought an atomic model that could manage an excellent balance between classical and quantum mechanical interpretation. A model that could compensate and explain the shortcomings and imperfections in the previous atomic models. The important postulates of the Bohr's atomic model are: 1. The electrons in an atom revolve round the nucleus only in certain permitted circular path called the shells or energy levels or stationary states. 2. Each energy level is denoted with a principal quantum number 'n'. Where n = 1, 2, 3, ..... 3. The shell or energy level closest to the nucleus is denoted with n = 1 or the K shell, the next one with n = 2 or L shell and so on ..... 4. These energy levels are associated with definite amount of energies, given by the formula: E n = -KZ 2 / n 2 where K = 13.6 ev, Z = atomic number and n = number of orbit from the nucleus. 5. The distance r of a shell