Select the correct option to test your answer: A 1s2 2s2 2p6 3s2 3p6 3d7 B 1s2 2s2 2p6 3s2 3p6 4s2 4p5 C 1s2 2s2 2p6 3s2 3p5 3d10 D 1s2 2s2 2p6 3s2 3p6 4s23d5 Correct Answer: Option D (1s2 2s2 2p6 3s2 3p6 4s23d5) Verified correct option for Chemistry (Chemistry).