When an atom undergoes beta decay, which of the following is true? a. the atomic number decreases by one and the element does not change. b. the atomic number increases by one and the element becomes a different element. c. the atomic number increases by two and the element becomes a different element. d. the atomic number decreases by four and the element becomes a different element.

"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."

the objects have the same charge.