Ionic Lewis structure

[nshahwan 1L]

How can you tell if the bond is ionic enough to write the lewis structure in that way? For example in 2B.9:2B.9 Draw the complete Lewis structure for each of the following compounds: (a) ammonium chloride; (b) potassium phosphide; (c) sodium hypochlorite.
Also, should we know the nomenclature for those?

[AGulati_4A]

If it is an anion and a cation then it is an ionic bond. KCl is ionic since K has a +1 charge while Cl- has a 1- charge. On the other hand, something like CH4 is a covalent bond since the C and the H both have a positive charge (4+ for the C and 1+ for the H)

[MinuChoi]

We're not being tested on nomenclature, so while it's probably good to know the basic ones (like ionic ones such as magnesium sulfide), there shouldn't be any questions that we can't do if we don't know nomenclature.