CHEMISTRY STUDY MATERIAL students find chemistry, hard to study in their exams, later on in their final year. However, with the help of these study material and with right preparation, students will be able to score better in their Grade and set the base on which they will work on their Final year and examinations . Important points: Key Notes for Classes 9 to 12 Chemistry Students are given here. Important topics Classes 9 to 12 Chemistry notes are covered. Chemistry notes will provide you with an overview of all the chapters and important points to remember. These are very useful summary notes with clearly explained examples for the best of the Classes 9 to 12 Chemistry books. Chemistry revision notes contain all the important information for students in a clear and concise manner. They are available in a free PDF downloadable format Chemistry revision notes is important because it helps to keep in mind the important facets and points. CLASS IX REVISION NOTES CLASS X REVISION
Posts
- Get link
- Other Apps
CBSE Class 9 Science Notes Chapter 4 Structure of the Atom Facts that Matter Fundamental particles of an atom: Three particles; electron, proton and neutron from which an atom is consisted of, are called fundamental particles of an atom or sub atomic particles. Discovery of Electron: By J. J. Thomson in 1897. He carried a cathode ray experiment in which observed a stream of negatively charged particles coming out of cathode towards the anode. These particles were named as electrons. Discovery of Proton: By Ernest Goldstein in 1886. He observed in the same gas discharge tube, with different situations that the anode emitted positive particles which he named as Canal Rays. His experiment led to the discovery of proton. Discovery of Neutron: By J. Chadwick in1932. Neutron is present in the nucleus of all atoms. 1. Thomson’s Model of Atom (by Joseph James Thomson in 1897) Thomson’s model of an atom proposed that: An atom is a uniform sphere of positive charges (due to presence of protons