What does the 2 mean in the formula 5Mg3(PO4)2

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

What does an electron configuration for an atom relate to the atoms placement on the periodic table