In the reaction BaCl2 (aq) + Na S04 (aq) BaSO4 (s) + 2NaCl (aq), what phases are the reactants in before the reaction? A. Both reactants are gases.
B. BaCl, is a liquid, and Na, SO4 is a gas.
C. BaCl, is a solid, and Na, SO4 is in aqueous solution.
D. Both reactants are in aqueous solution.

"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."

let that person have a turn to speak : )