The following equation is balanced. Choose ALL of the true statements which apply to its interpretation.

CaF2 + H2SO4 > CaSO4 + 2 HF

(a) The number of moles of calcium fluoride equals the number of moles of calcium sulfate (i. e., is in a 1:1 ratio).
(b) Two grams of HF are produced from one gram of calcium fluoride.
(c) There are 2 moles of fluorine atoms for the reactants and 2 moles of ions for the products.
(d) Hydrogen fluoride is a product of this reaction.

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"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."