<span> The atomic number increases by one and the element becomes a different element. </span>
Answer: Mixtures do not have the same composition, properties, and appearance throughout.
Explanation: It does not vary from sample to sample.
In the first shell there is 2 electrons and on the second shell there is 4 elections.
3Fe(s) + 4H2O(l) — 1Fe3O4(s) + 4H2(g)