Helium, Neon, Argon These elements are some of the noble gases. At ground state, they have complete outer shells making them non-reactive. Helium ( He ), Neon ( Ne ), and Argon ( Ar ). Just wanted to add the chemical symbol just in case you needed to write that down too. helium, neon, argon, xenon and redon, these 5 elements among all have their outer shell filled up.