Plum pudding model vs nuclear model

The negatively charged electrons are found on shells (and they orbit the central nucleus) in the nuclear model whereas in the plum pudding model the electrons are found randomly distributed in the positively charged “soup” The nuclear model features neutrons whereas the plum pudding model does not (why?) Mass is concentrated in the centre of the atom in nuclear model whereas mas is evenly distributed in the plum pudding model nuclear model the atom mainly empty space whereas plum pudding model is a ‘solid’ mass nuclear model positive charge occupies only a small part of the atom whereas in the plum pudding model positive charge spread throughout the atom