What is the Electron configuration for the inert gas in period 3?

In period 3? It has to be Boron although technically it is not a gas. The electron configuration is either 2, 3 or 1s^2, 2s^2, 2p^1 depending on what level of chemistry you are working at. If the latter looks like a different language you to, go with the first!

that is actually wrong above^^, the real answer is argon so its electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6