____3. What is the correct electron configuration of a Chlorine atom?

A. 1s
1 2s
2 C. 1s
2 2s
2 2p
6 3s
2 3p
5

B. 1s
1 2s
2 2p
6 3s
3 2p
5 D. 1s
2 2s
2 2p
6 3s
3 2p
4