Element that completes n=3?

I'm stuck on that one.. is probably something simple but I don't seem to know that information. can someone help me with this and tell me how you came up with this answer...?

Answer:
Argon? That's 3s23p6, but it doesn't include the 3d electrons.

Zn(2+) would be 3s23p63d10

If you want a clever answer, maybe that's the way to go!
n can be almost directly correlated with period number, so Argon it is.

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