the answer is d, cuz i just did it rn on my study island and i got it right :)
<span><span>Number of Protons-19 </span><span>Number of Neutrons-20 </span><span>Number of Electrons-<span>19</span></span></span>
Wave "B" is thinner. Is this the whole question?
Iron is left in the filter and salt solution (salt and water) passes into the cup.
Hope it helps