Final answer:
The greatest number of anions that could be packed around a cation would be small anions with a low electric charge, as they are less repulsive and can fit more closely together.
Step-by-step explanation:
The question is asking which anion size and charge combination would allow the greatest number of anions to be packed around a cation. Considering ionic radii and charge, we know that small anions can pack more closely around a cation than large anions, and anions with a low electric charge will exert less repulsive force on neighboring anions than those with a high charge. Therefore, the most packed arrangement around a cation would be with anions that are both small and have a low charge.