What do you mean by 'Plum pudding model'?
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Answer:
The 'plum pudding' model of the atom was proposed by JJ Thomson, who had also discovered the electron. ... According to this model, the atom is a sphere of positive charge, and negatively charged electrons are embedded in it to balance the total positive charge. The electrons are like plums in a pudding.
The plum pudding model is described by electrons surrounded by a positive-charged volume, similar to negatively-charged "plums" contained in a positively-charged "pudding" (thus the name). The earliest model to depict the atomic structure of matter was Thomson's Plum Pudding Model.
The plum pudding model (also known as Thomson's plum pudding model) is a scientific model of the atom that dates back to the 1800s. Like negatively-charged "plums" buried in a positively-charged "pudding," the plum pudding model is defined by electrons surrounded by a volume of positive charge (hence the name).
Sir Joseph John J.J. Thomson, an English physicist, presented the plum pudding model shortly after the discovery of the electron but before the discovery of the atomic nucleus. The concept attempted to explain two previously understood facts of atoms: electrons are negatively charged particles and atoms have no net electric charge.