1904 Thomson Joseph John model atom is a ball with positive charges, and electrons are embedded in it. The atom is like a Plum pudding, hence the name "jujube cake model" or "raisin cake model"; Or, like watermelon seeds in watermelon pulp, it is also called "watermelon model".

Thomson Joseph John discovered electrons in 1897, which negated Dalton's "solid ball model".

Raisin cake model (jujube cake model/watermelon model) was put forward by Thomson Joseph John, which is the first atomic model with subatomic structure.

Based on the discovery of electrons, Thomson Joseph John proposed an atomic raisin cake model (jujube cake model/watermelon model).

principle

(1) electrons are evenly distributed throughout the atom, just as they are scattered in a sea of uniform positive charges, and their negative charges and those positive charges cancel each other out. (2) when excited, electrons will leave the atom and produce cathode rays.