The plum pudding model of the atom states that each atom has an overall negative charge. each atom has a dense, positively charged center. an atom is a solid, indivisible sphere that makes up all matter. an atom is made up of electrons in a sea of positive charges

The Plum-Pudding Model was put forth by J.J.Thompson to explain the structure of an atom. According to this model, an atom was made of negatively charged electrons which were embedded in a sea of positive charges. As per the model the number of negative charges balance out the number of positive charges making an atom neutral.

Ans) An atom is made up of electrons in a sea of positive charges