Chemistry (Year 11)
Atomic Structure
What is the electronic configuration of a chlorine atom?
1s² 2s² 2p⁶ 3s² 3p⁵
1s² 2s² 2p⁶ 3s² 3p⁴
1s² 2s² 2p⁶ 3s² 3p³
1s² 2s² 2p⁶ 3s² 3p²