What I Have Learned Directions: Fill in the blanks with the correct answer. Write your answers on a separate sheet of paper. 1. Towards the 19th century, Joseph John Thomson was able to discover that atoms have negatively charged particles, which he called It led him to propose a new model for the atom, which he called the model of the atom. 2. In the plum pudding model of the atom, negatively charged electrons were embedded in a cloud of charge 3. Ernest Rutherford and his team performed the experiment to test the model of Joseph John Thomson. They fired alpha particles on a thin sheet of gold foil. 4. Observations in the gold foil experiment are the following: Most of the alpha rays just through the gold foll. A small portion of the alpha particles was deflected. . An even smaller portion of the alpha particles bounced right back, 5. These observations suggested a different structure of the atom where all the positive charge and nearly all the mose of the atom were concentrated in a very tiny region called the at the center of the atom. This model 6. The new model of the structure of the atom is called the describes the atom as having a nucleus at its center,​