This is the periodic table of the elements. Javier's teacher gives him four cards, each displaying information about an element, and asks him to put them in order of reactivity. The elements are carbon (C), helium (He), magnesium (Mg), and potassium (K). Javier arranges the elements in order from most reactive to least reactive, as shown in the diagram. Is Javier's arrangement correct? Why or why not?