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Answer:
The statement you provided describes a simplified model of an atom known as the "plum pudding model" or the Thomson model.
In the plum pudding model:
- The positive charges represent the diffuse positive mass of the atom.
- The negatively charged electrons are embedded within the positive mass.
This model was proposed by J.J. Thomson in the late 19th century before the discovery of the atomic nucleus. Later experiments, such as the Rutherford gold foil experiment, led to the development of the nuclear model of the atom, where most of the mass is concentrated in the nucleus, and electrons orbit around the nucleus in discrete energy levels.