If identical organisms have the same chromosomes, what should be true for organisms that are different from each other?

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

Is this correct if not can u correct me