What happens to metals when they form an ion?

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Cation

Explanation: -

Metals have low ionization enthalpy. So they tend to lose it's electrons to fulfill octet.

Upon losing electrons, a metal atom has more protons than neutrons.

The electrical neutrality of the atom is no longer there.

The metal atom after losing electron has a positive charge.

They are referred to as cations.

Lower the group of periodic table an element is found, more is it's tendency to form cations.

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.