How was rutherford’s gold foil experiment inconsistent with the plum pudding model of the atom?

According to the plum pudding model of the atom proposed by J.J. Thomson, the atom was considered to be a positive charge sphere in which electrons (negatively charged) are embedded in order to balance the positive charge.

According to Rutherford’s gold foil experiment, when he bombarded particles to the gold foil he observed that most of the particles went through, some of them got scattered in various directions, and few are deflected back to the source. Hence, this experiment shows that the plum pudding model was incorrect as; if there was the symmetrical distribution of the charges then all the particles will pass through without any deflection.  

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."