Which of the following electron configurations represents an element with similar chemical properties to an element with the electron configuration of 1s^2 2s^2 2p^6?
A) 1s^2 2s^2 2p^5
B) 1s^2 2s^1
C) 1s^2 2s^2 2p^6 3s^2 3p^5
D) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
e) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
