J.J.+Thomson_B5

​ J.J. Thomson


 * [[image:jj.jpg]]

v Around 1897 a scientist called J.J. Thompson showed that atoms contained small particles with a negative charge. ||
 * v He named the particles electrons. ||
 * v Thompson knew that atoms had no charge, i.e. were neutral. ||
 * v This meant a positive charge in the atom must be present to balance the negative charge of the electrons. ||
 * v Thompson proposed a model for the structure of an atom from his experiments. ||
 * v He said the negatively charged electrons were embedded in a sphere of positive charge so the charges were balanced. ||
 * v This became known as the 'plum pudding' model of the atom <span style="color: #00b0f0; font-family: 'Comic Sans MS'; font-size: 10pt; mso-bidi-font-family: Arial; mso-fareast-font-family: 'Times New Roman';"> ||