Raisin Cake (Plum Pudding Model) refers to a model, which can also be translated as "Date Cake Model" also known as "Watermelon Model", also known as "Tomson Model", "Date Cake Model", "Watermelon Model", "Watermelon Model", "Tom Sun Model", "Date Cake Model", "Watermelon Model", "Tom Sun Model", "Tom Sun Model", "Tom Sun Model". "

19th century

In 1903, physicist J.J. Thomson (1856-1940) proposed a model for the structure of the atom, which was called the raisin cake model.

Thomson's model suggests that positive charges are uniformly distributed throughout the atomic sphere (the sphere's diameter is on the order of 10 to the -10th power of a meter), and negatively charged electrons are scattered throughout the atom in symmetrically distributed positions. When these electrons are at rest in an equilibrium position, the electrons vibrate and cause the atom to emit light.

Historically, Thomson's model of the atom was widely recognized for some time, before being replaced by Rutherford's nuclear model.