The free-electron model of metals assumes that the outermost valence electrons of each atom are free to roam about the metal. In its simplest form, the metal is modeled as a box with zero potential energy inside and infinite potential energy outside. To describe the behavior of electrons in such a potential, we need to determine the allowed quantum states and how the electrons are distributed among those states. The number of quantum states available with energies

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

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.

explanation:

0.07 g/cm³

1.37 g/cm³