The electronic configuration of an element is given below. element 1: 1s22s22p4 which statement about the reactivity of the element is true? a. it is reactive because it has to gain an electron to have a full outermost energy level. b. it is unreactive because it has to lose an electron to have a full outermost energy level. c. it is reactive because it has to gain two electrons to have a full outermost energy level. d. it is unreactive because it has to gain two electrons to have a full outermost energy level.