Monthly archives: February, 2015

Bohr’s Atomic Model

Bohr’s Atomic Model Neils Bohr in 1913 gives a simple model for atomic structure based on the quantum theory. Main assumption of Bohr atomic model- 1. All atoms consist of dense, very small, positively charged nucleus that have all protons and neutrons in it. 2. Electron revolve around nucleus in definite energy paths known as orbits, …

Rutherford Model of Atom

Rutherford Model of Atom This experiment is also known as alpa () particle scattering experiment. Rutherford bombard alpha particle on gold foil of thickness 0.0004cm and found that- 1. So many particles passes through the gold foil without any deflection. 2. Some alpha particle are deflected at different angles. 3. Very few about 1 in …

Thomson’s Atomic Model

Thomson’s Atomic Model Thomson’s Atomic Model Thomson’s atomic model is first atomic model proposed in 1898 related to atomic structure. This model is similar to water-melon in which positive charge protons is like pulp in which negative charge electrons like seeds in water-melon, also known as pudding model. This model is called Thomson’s atomic model. …

Dalton Atomic Theory

Dalton Atomic Theory John Dalton was an English chemist, physicist, and meteorologist. He developed modern atomic theory. Postulates of Dalton’s Atomic Theory The main points of Dalton’s atomic theory were explained below- Elements are made-up of very small particles known as atoms. Atoms of an element are identical in mass, size and many other chemical …