I believe it has something to do with the H2O molecules, because a chemical compound is not a mixture.
Explanation:
<h2>see the attachment. hope it will help you... </h2>
That looks like cells of a multicellular organism, so B.
Answer: Yttruim: 39 protons, 50 neutrons, 39 electrons
Ruthenium: 44 protons, 57 neutrons, 44 electrons