Question

(5:15)
what atomic model did thomson propose after discovering the electron?
the planetary model
the plum pudding model
the quantum model
the nuclear model

6:00)
what did ernest rutherfords gold foil experiment reveal about the atom?
atoms are solid spheres.
electrons move randomly in a cloud.
most of the atom is empty space with a dense nucleus.
the nucleus contains only electrons.

Explanation:

• For the first question: J.J. Thomson proposed the plum pudding model after discovering the electron. In this model, the atom was thought of as a "pudding" (a positively - charged mass) with "plums" (electrons) embedded in it.
• For the second question: Ernest Rutherford's gold foil experiment showed that most of the atom is empty space. When alpha particles were shot at a thin gold foil, most of them passed through, but a small number were deflected at large angles. This led to the conclusion that there is a dense, positively - charged nucleus at the center of the atom.

Answer:

• First question: The plum pudding model
• Second question: Most of the atom is empty space with a dense nucleus