1.Which of the following elements are in the same period as magnesium (Mg)? Mn none of the above Sr Ca Cl 2.Why isn't dirt listed in the periodic table? None of the above is true. Elements like dirt and air are so common that there is no need to list them in the periodic table. Dirt IS listed in the periodic table but is not easily recognized because it is listed as one of the rare earths with its old scientific name, dysprosium, symbol Dy. The periodic table lists only elements made of one kind of material. Dirt is a mixture of elements and compounds.