J.J.+Thomson



This became known as the 'plum pudding' model of the atom   ** ||
 * Around 1897 a scientist called J.J. Thompson (pictured left) showed that atoms contained small particles with a negative charge. ||
 * He named the particles electrons. ||
 * Thompson knew that atoms had no charge, i.e. were neutral. ||
 * This meant a positive charge in the atom must be present to balance the negative charge of the electrons. ||
 * Thompson proposed a model for the structure of an atom from his experiments. ||
 * He said the negatively charged electrons were embedded in a sphere of positive charge so the charges were balanced. ||