What material makes up the planets in our solar system? a. heavy metals created in the big bang b. material that shot out of the sun about 10 billion years ago c. material captured from a passing galaxy about 10 billion years ago d. debris from previous stars which had exploded

d. debris from previous stars which had exploded.

"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."