Answer:
10
Explanation:
the capacity for each shell for the first 20 elements can be given by
2.8.8.2
2 electrons in the first shell
8 in the 2nd and in the 3rd
and 2 in the 4th
so if both the first and 2nd shells are full,
2+8=10 electrons
D is the answer cause two h20 + o2(g)
Exsperements? labs? chemesty? it could be a few things...
Every time you add water to a solution the concentration decreases<span />