Which of the Following Electron Configuration Is Correct for the Element

Which of the following electron configuration is correct for the element or ion shown with it? Hint: Consider your exceptions to the orbital filling rules.

A) Se: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s³ 4p³
B) Zn: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s³ 3d⁹
C) Br^?: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹¹ 4p⁶
D) Cu²⁺: 1s² 2s² 2p⁵ 3s³ 3p⁶ 3d⁹
E) Sr²⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶