1. An ionic compound made from Mg and F must be MgF2. Why is this the case? In y

1. An ionic compound made from Mg and F must be MgF2. Why is this the case? In your answer consider the charges on Mg and F, based on their positions in the periodic table.
2. The correct name for Cu2+ and Cl- forming CuCl2 is copper(II) chloride, however Ba2+ and Cl- forming BaCl2 is not written barium(II) chloride (instead written as just barium chloride). Why? (Hint – think about where copper is in the periodic table)
3. Notice in question 2 above, neither ionic compound is written as a dichloride, yet for covalent compounds it would be written that way (e.g. OF2 is oxygen difluoride). This is because a metal cation has a certain charge, then the non metal anions have to combine in only one possible proportion. But covalent compounds rely on sharing and can do so in multiple ways, so the number of elements is specified by prefixes (di, tri, tetra etc.). The question is, what is the name for P2F4?

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