Classify each statement as true or false. Drag the appropriate items to their respective bins. View Available Hint(s) Period 3 elements have six 2p electrons. The valence electrons of group 5A elements are in the 6s subshell. Group 8A elements have completely full outer principal shells. True The highest principal quantum number of period 2 elements is 2. Period 4 elements have an inner electron configuration of [Ar]. The highest principal quantum number of period 3 elements is 4. False Reset Help The valence electrons of group 2A elements are in an s subshell. Period 5 elements have an inner electron configuration of [Xe].