List the two factors that affect ionic bond formations. Describe the trends of one of these factors in the periodic table.
Please help.

Cationic radius.

Charge density.

Explanation:

Across the period, cationic radius is almost constant and charge density increases due to increase in charge magnitude, hence increase decrease in ionic character.

Down the group, cationic radius increases and charge density is constant, hence decrease in charge density which increases the ionic character.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.