How did ernest rutherford's discovery affect the model of the atom? a. it proposed that the positive charge was concentrated in the nucleus . b. it proposed that atoms are mostly composed of empty space. c. it proposed the idea that electrons were mobile in the atom. d. it proposed that electrons orbit the nucleus like the planets in the solar system.

It proposed that the positive charge was concentrated in the nucleus.

i just took the test. this is right.

"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."