Find the Noble Gas

Chemistry

The following are electron configurations of neutral atoms. Which one represents a noble gas?

\ 1s^2 2s^2 2p^6 3s^2 3p^6

\ 1s^2 2s^2 2p^5

\ 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8

\ 1s^2 2s^2 2p^6 3s^1