In general, how many valence electrons do transition metals have? (Valence are highest n, only s and p sublevel) What ion is likely to form with transition metals? Speculate as to why you think some transition metals can form multiple ions?

2 valence electrons.

Explanation:

Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is  

n

s

2

(

n

−

1

)

d

, so those  

n

s

2

electrons are the valence electrons

it means there are 3 atoms of oxygen

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.