Yes. Helium, Xenon, and Neon have stable electron numbers (octette rule).
1s 2s
1s^2 2s^2 2p^6
Argon, Krypton, and Xenon, if you're talking about only outer shell configuration. If you're talking about whole-atom configuration some answers would be O-2, F-1, Na+, Mg+2.
Tin has 4 valence electrons. Because of this, Tin needs to lose the 4 electrons to make it stable. Thus the answer is SN4+