Chemistry (Year 12)
Electron Configuration
What is the electron configuration of chlorine (Cl, atomic number 17)?
1s2 2s2 2p6 3s2 3p5
1s2 2s2 2p6 3s2 3p4
1s2 2s2 2p6 3s2 3p6
1s2 2s2 2p6 3s2 3d5
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