2. What is the difference between a formula unit for an ionic compound and a molecular formula

for a molecule?

Explanation:

In chemistry, a formula unit refers to the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. A formula unit is thus the lowest whole number ratio of ions represented in an ionic compound.

While

A molecular formula comprises the chemical symbols for the constituent elements, followed by numeric subscripts specifying the number of atoms of each element present in a molecule.

"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."

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