![charge of electron charge of electron](https://1401700980.rsc.cdn77.org/data/images/full/94777/blue-electricity.jpeg)
Cathode ray tubes are vacuum-sealed glass tubes that have had most of the air removed. Thomson, a scientist, began working with cathode ray tubes in the early 1900s. In this article, we will discuss the discovery of electrons using the Cathode ray tube by William Crooke and later the actual discovery of electrons by J.J. proton and neutron) and also the actual structure of the atom. Thus, the electron is the first sub-atomic particle to be discovered and this paved the way for the discovery of all other sub-atomic particles (i.e. Thomson first proved the existence of negatively charged particles within an atom called electrons. But, later these postulates were proved wrong as the first indication of sub-atomic particles came due to the study of static electricity by Faraday which says that the flow of electricity is caused by due to the charged particles. The above statements are called the Postulates of Dalton’s Atomic Theory.
![charge of electron charge of electron](http://2.bp.blogspot.com/-miWSKzpO7Eg/UpIvoT7--tI/AAAAAAAAAAs/y6t25myyLA8/s1600/periodic+table+valence+electrons.png)
Atoms of an element combine in a simple whole-number ratio to form molecules.Atoms of the same element are alike in all respect but they differ from the atoms of the different elements.
![charge of electron charge of electron](https://i.ytimg.com/vi/hqFBYL8Lqjk/hqdefault.jpg)
Atoms can neither be created nor be destroyed.Matter consists of tiny indivisible particles called Atoms.Theorem - Angle opposite to equal sides of an isosceles triangle are equal | Class 9 Maths.Theorem - The sum of opposite angles of a cyclic quadrilateral is 180° | Class 9 Maths.Mean, Median, Mode, and Range - Statistics | Class 9 Maths.Mid Point Theorem - Quadrilaterals | Class 9 Maths.What is a Storage Device? Definition, Types, Examples.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.